A transmission shaft support structure of a coaxial multi-toothed belt wheel mechanism and a mounting method

Abstract

The application discloses a transmission shaft support structure and mounting method of a coaxial multi-toothed pulley mechanism, and relates to the technical field of toothed pulley mechanisms. The transmission shaft support structure comprises a support element, which is sleeved on the cantilever end of the transmission shaft; an adapter seat, which is arranged on the radial outer side of the support element and is detachably connected with the rack of a high-speed hard-box cigarette packaging machine, so that the support element and the rack are bridged. During operation, the transmission shaft rotates around its own axis in the support element, the radial load generated by the pulley at the cantilever end is transmitted to the adapter seat through the support element, and then is transmitted to the rack of the machine. Thus, the radial load and overturning moment generated by the pulley at the original cantilever end can be transmitted to the rack through the support element and the adapter seat, and the load is shared by the rack, so that the radial bending moment and the overturning moment borne by the original support bearing are reduced, the degree of uneven load distribution in the bearing is reduced, and the service life of the original support bearing is prolonged.

Description

Technical Field

[0001] This application relates to the field of toothed pulley mechanism technology, specifically to a transmission shaft support structure and installation method for a coaxial multi-toothed pulley mechanism. Background Technology

[0002] In automated packaging, printing, and assembly production lines, toothed belt (synchronous belt) drives are commonly used to achieve precise step-by-step conveying of workpieces. To simplify the structure and achieve multi-channel synchronous drive, multiple toothed pulleys are often mounted on the same drive shaft, forming a coaxial multi-toothed pulley mechanism. For example, this type of mechanism is used in the cigarette pack conveying system of high-speed hard-pack cigarette packaging machines (such as the ZB48A model), where a single drive shaft drives multiple synchronous pulleys, thereby driving multiple parallel synchronous conveyor belts.

[0003] In traditional coaxial multi-tooth pulley mechanisms, the drive shaft is typically supported by bearing housings at only one or both ends. When there are a large number of pulleys on the shaft and their arrangement is long, especially when one or more pulleys form a cantilever structure at the shaft end, the stress condition of the supporting bearing deteriorates drastically. The pulley load at the cantilever end generates significant radial bending moment and overturning moment on the supporting bearing with a large lever arm, resulting in uneven load distribution within the bearing and thus causing rapid wear and premature failure. Summary of the Invention

[0004] The main objective of this application is to provide a transmission shaft support structure and installation method for a coaxial multi-toothed pulley mechanism, aiming to solve the technical problem that the pulley load at the cantilever end of the transmission shaft will generate significant radial bending moment and overturning moment on the support bearing with a large lever arm, resulting in uneven load distribution inside the bearing and thus causing rapid wear and early failure of the bearing.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A transmission shaft support structure for a coaxial multi-toothed pulley mechanism includes a frame for a high-speed hard-pack cigarette packaging machine, and further includes:

[0007] A support member is sleeved on the cantilever end of the drive shaft, with its central axis coinciding with the axis of the drive shaft and rotating in cooperation with the drive shaft to allow the drive shaft to rotate around its own axis.

[0008] The adapter has one end located on the radially outer side of the support member and the other end detachably connected to the frame of the high-speed hard-pack cigarette packaging machine, so as to form a bridge between the support member and the frame.

[0009] Optionally, the support member includes:

[0010] A support ring has a bearing component coaxially mounted in its inner hole, and the outer ring of the bearing component is fixedly fitted with the inner hole of the support ring, while the inner ring of the bearing component is fitted with the cantilever end of the drive shaft.

[0011] The fixed fit is either an interference fit or a transition fit.

[0012] Optionally, the adapter includes:

[0013] The vertical section has one end connected to the radial outer periphery of the support ring, and the other end is vertically connected to the horizontal section, which extends away from the vertical section to form an L-shaped structure. The horizontal section has waist holes along its thickness direction, and there are two waist holes arranged along the length direction of the horizontal section, so that the horizontal section can be connected to the frame of the high-speed hard-pack cigarette packaging machine through the waist holes and bolts.

[0014] Optionally, the end of the vertical segment away from the horizontal segment is an arc-shaped mating surface that matches the radial outer periphery of the support ring, and the arc-shaped mating surface is fixedly connected to the radial outer periphery of the support ring.

[0015] Optionally, the end of the vertical segment furthest from the horizontal segment is a plane;

[0016] The support ring has a locking box on its radial outer periphery. The locking box has a locking hole that matches the vertical section along its height direction. A spring is installed in the locking hole. A positioning block is connected to one end of the spring near the vertical section, and the positioning block slides in conjunction with the locking hole.

[0017] The lock box has a first pin hole along its thickness direction, and the first pin hole is connected to the lock hole. The vertical section has a second pin hole corresponding to the first pin hole along its thickness direction.

[0018] Optionally, it also includes a pin adapted to the first pin hole and the second pin hole, wherein the end of the pin away from its head has a radial through hole adapted to the cotter pin.

[0019] Optionally, the opening edge of the lock hole is provided with a first tapered guide surface, and the opening edge of the first pin hole is provided with a second tapered guide surface.

[0020] Optionally, the bearing component is a rolling bearing, and the inner ring of the rolling bearing is interference-fitted with the drive shaft;

[0021] The rolling bearing is either a needle roller bearing or a deep groove ball bearing.

[0022] Optionally, the bearing component is a sliding bearing, and the inner bore of the sliding bearing is clearance-fitted with the drive shaft;

[0023] The sliding bearing is a sliding bushing.

[0024] An installation method, applied to the drive shaft support structure described above, the method comprising:

[0025] S1, connect one end of the adapter to the radial outer side of the support;

[0026] S2, rotate the support member onto the cantilever end of the transmission shaft, and make the central axis of the support member coincide with the axis of the transmission shaft;

[0027] S3, adjust the axial position of the support member on the drive shaft so that the other end of the adapter is aligned with the reserved installation position on the frame of the high-speed hard-pack cigarette packaging machine.

[0028] S4, adjust the circumferential position of the support member on the drive shaft so that the other end of the adapter seat gradually approaches the frame of the high-speed hard-pack cigarette packaging machine until it fits the reserved installation position;

[0029] S5, screw in the locking fastener to connect and lock the adapter to the frame of the high-speed hard-pack cigarette packaging machine.

[0030] The technical solution provided in this application can include the following beneficial effects: When this application is in operation, the drive shaft rotates around its own axis within the support member. The radial load generated by the pulley at the cantilever end is transmitted to the adapter seat through the support member, and then to the unit frame through the adapter seat. Thus, the radial load and overturning moment generated by the pulley at the original cantilever end can be transmitted to the frame through the support member and the adapter seat, with the frame sharing the load. This reduces the radial bending moment and overturning moment borne by the original support bearing, reduces the degree of uneven load distribution within the bearing, and thereby extends the service life of the original support bearing. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the assembly structure of the drive shaft support structure and the drive shaft;

[0033] Figure 2 This is a schematic diagram of the drive shaft support structure;

[0034] Figure 3 This is a schematic diagram of the separate structure of the lock box and the adapter.

[0035] Figure 4 This is a schematic diagram of the external structure of the lock box;

[0036] Figure 5 This is a schematic diagram of the internal structure of the lock box;

[0037] Figure 6 This is a structural diagram of the pin.

[0038] Reference numerals in the attached drawings: 1. Support component; 2. Drive shaft; 3. Adapter seat; 4. Support ring; 5. Vertical section; 6. Horizontal section; 7. Waist hole; 8. Lock box; 9. Lock hole; 10. Spring; 11. Positioning block; 12. First pin hole; 13. Second pin hole; 14. Pin shaft; 15. Cotter pin; 16. First tapered guide surface; 17. Second tapered guide surface. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are merely some, not all, of the embodiments of this application. Unless otherwise specified, the embodiments and features described in this application can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0040] Example 1:

[0041] See Figure 1 and 2 A transmission shaft support structure for a coaxial multi-toothed pulley mechanism includes a frame for a high-speed hard-pack cigarette packaging machine (not shown in the figure), and further includes:

[0042] Support 1 is sleeved on the cantilever end of the drive shaft 2, with its central axis coinciding with the axis of the drive shaft 2 and rotating in cooperation with the drive shaft 2 to allow the drive shaft 2 to rotate around its own axis;

[0043] The adapter 3 has one end located on the radial outer side of the support member 1, and the other end is detachably connected to the frame of the high-speed hard-pack cigarette packaging machine, so that a bridge is formed between the support member 1 and the frame.

[0044] Specifically, in the cigarette pack conveying system of a high-speed hard-pack cigarette packaging machine (such as the ZB48A model), a drive shaft 2 drives multiple synchronous pulleys, which in turn drive multiple parallel synchronous conveyor belts. In traditional coaxial multi-tooth pulley mechanisms, the drive shaft 2 is usually supported by bearing housings at only one or both ends. When there are many pulleys on the shaft and their arrangement is long, especially when one or more pulleys at the shaft end form a cantilever structure, the stress condition of the supporting bearing deteriorates drastically. The pulley load at the cantilever end will generate significant radial bending moment and overturning moment on the supporting bearing with a large lever arm, causing uneven load distribution inside the bearing, thereby triggering rapid wear and premature failure of the bearing.

[0045] In this application, a support member 1 is fitted onto the cantilever end of the drive shaft 2, specifically in the weakest stress section of the cantilever end. The inner hole of the support member is in movable fit with the outer circumference of the drive shaft 2, meaning that the support member 1 and the drive shaft 2 can rotate relative to each other, but the support member 1 provides radial support to the drive shaft 2. The central axis of the support member 1 coincides with the axis of the drive shaft 2, ensuring that the drive shaft 2 experiences uniform force during rotation and reducing or preventing sway.

[0046] A transition seat 3 is provided on the radially outer side of the support member 1. One end of the transition seat 3 is connected to the radially outer side of the support member 1. This connection can be a fixed connection, such as welding the transition seat 3 to the support member 1; or it can be a detachable connection, such as a locking, snap-fit, or bolt fastening, allowing the transition seat 3 and the support member 1 to be separated as needed. Regardless of the connection method, under normal operating conditions, there is no relative displacement between the transition seat 3 and the support member 1, ensuring reliable load transfer. The transition seat 3 transfers the load borne by the support member 1 to the equipment frame, while also accommodating the spatial layout between the support member 1 and the frame.

[0047] The other end of the adapter 3 is detachably connected to the frame of the high-speed hard-pack cigarette packaging machine, thus bridging the support 1 and the frame. Specifically, the other end of the adapter 3 extends radially outward from the support 1 and curves according to space until it reaches the reserved installation position on the frame of the high-speed hard-pack cigarette packaging machine. After the support 1 is assembled into the weakest section of the cantilever end of the drive shaft 2, the other end of the adapter 3 is aligned with the reserved installation position so that the adapter 3 can be detachably connected and locked to the frame. This reserved installation position is already present on the machine frame and is equipped with screw holes or other connection interfaces.

[0048] During installation, first connect one end of the adapter 3 to the radially outer side of the support 1 to form an assembly. Then, fit the support 1 onto the cantilever end of the drive shaft 2, so that the entire assembly is located at the cantilever end of the drive shaft 2, while aligning the central axis of the support 1 with the axis of the drive shaft 2. Next, adjust the axial and circumferential positions of the assembly on the drive shaft 2, positioning it in the weakest stress section of the cantilever end, and align and fit the other end of the adapter 3 with the reserved installation position on the unit frame. Finally, lock the adapter 3 onto the frame using a detachable connection to complete the installation.

[0049] During operation, the drive shaft 2 rotates around its own axis within the support member 1. The radial load generated by the pulley at the cantilever end is transmitted to the adapter 3 via the support member 1, and then to the unit frame via the adapter 3. Thus, the radial load and overturning moment generated by the original pulley at the cantilever end can be transmitted to the frame via the support member 1 and the adapter 3, with the frame sharing the load. This reduces the radial bending moment and overturning moment borne by the original support bearing, decreases the degree of uneven load distribution within the bearing, and consequently extends the service life of the original support bearing.

[0050] Example 2:

[0051] See Figure 2 Based on Embodiment 1, optionally, the support member 1 includes:

[0052] The support ring 4 has a bearing component (not shown in the figure) coaxially mounted in its inner hole, and the outer ring of the bearing component is fixedly fitted with the inner hole of the support ring 4, and the inner ring of the bearing component is fitted with the cantilever end of the transmission shaft 2.

[0053] The fixed fit is either an interference fit or a transition fit.

[0054] Specifically, the outer ring of the bearing component and the inner hole of the support ring 4 are in a fixed fit, which can be either an interference fit or a transition fit. With an interference fit, the outer ring of the bearing component is pressed into the inner hole of the support ring 4, generating a radial preload between them to ensure no relative rotation or axial movement occurs under load. With a transition fit, there is a slight clearance or slight interference between the outer ring of the bearing component and the inner hole of the support ring 4. During assembly, it can be installed using a press-fit tool or a temperature difference method, and if necessary, an axial retaining ring or end cap can be used for axial positioning. Regardless of whether an interference fit or a transition fit is used, the purpose is to ensure that there is no relative movement between the outer ring of the bearing component and the support ring 4 under normal operating conditions, thereby ensuring a stable and reliable load transmission path from the drive shaft 2 to the support ring 4.

[0055] The inner ring of the bearing is fitted onto the cantilever end of the drive shaft 2. The inner ring and the drive shaft 2 are in a mating relationship to allow the drive shaft 2 to rotate around its own axis and to provide radial support to the drive shaft 2. This mating can be selected in different ways depending on the specific type of bearing.

[0056] When the bearing needs to be replaced due to long-term use, the bearing can be removed from the inner hole of the support ring 4, replaced with a new bearing, and then reinstalled. There is no need to replace the entire support ring 4, nor is it necessary to disassemble the adapter 3 connected to the support ring 4, making maintenance more convenient.

[0057] Optionally, the adapter 3 includes:

[0058] The vertical section 5 has one end connected to the radial outer periphery of the support ring 4, and the other end is vertically connected to the horizontal section 6, which extends away from the vertical section 5 to form an L-shaped structure. The horizontal section 6 has a waist hole 7 along its own thickness direction, and there are two waist holes 7 arranged along the length direction of the horizontal section 6 so that the horizontal section 6 can be connected to the frame of the high-speed hard-pack cigarette packaging machine through the waist holes 7 and bolts.

[0059] Specifically, the adapter 3 consists of two parts: a vertical section 5 and a horizontal section 6, which are integrally formed or welded together. The vertical connection between the vertical section 5 and the horizontal section 6 allows the adapter 3 to be led out radially from the support ring 4, then turn and extend in a direction parallel to the axis of the drive shaft 2 until it reaches the reserved installation position on the unit frame.

[0060] The horizontal segment 6 has two slotted holes 7 along its thickness, arranged sequentially along its length. These slotted holes 7 provide a passage for bolts. After passing through the slotted holes 7, the bolts are screwed into the threaded holes on the unit frame, detachably connecting and locking the adapter 3 to the frame. The elongated structure of the slotted holes 7 allows for fine-tuning of the bolt's position along the length of the horizontal segment 6 within the slotted holes 7, thus reducing the difficulty of aligning the bolts with the threaded holes during installation, simplifying assembly, and saving time.

[0061] During installation, the support structure is then fitted onto the cantilever end of the drive shaft 2. The axial and circumferential positions of the support component 1 on the drive shaft 2 are adjusted so that the two oblong holes 7 on the horizontal section 6 are aligned with the corresponding screw holes on the unit frame. Finally, the bolts are passed through the oblong holes 7, screwed into the screw holes of the frame, and tightened to complete the detachable connection between the adapter 3 and the frame.

[0062] It should be noted that the number and arrangement direction of the waist holes 7 can be adjusted according to the actual connection strength requirements and the position of the frame screw holes. When stronger connection rigidity is required, the number of waist holes 7 can be increased; when the frame screw holes are not arranged in a straight line, the arrangement direction of the waist holes 7 can also be adjusted accordingly. This embodiment uses the arrangement of two waist holes 7 along the length of the horizontal segment 6 as an example for illustration, and is not a limitation on the number and arrangement of the waist holes 7.

[0063] It should be noted that the shape of the adapter 3 can be selected and adjusted according to the actual space conditions between the support 1 and the unit frame. For example, when there is interference from other components, an L-shaped or U-shaped structure can be used to bypass the interference; when there is no interference from other components, the adapter 3 can also use a rectangular block structure to fill the space and provide a stable connection. Regardless of how the external shape of the adapter 3 changes, the end connected to the support 1 only needs to ensure a reliable radial connection with the outer side of the support 1.

[0064] Example 3:

[0065] See Figure 2 Based on the above embodiments, optionally, the end of the vertical segment 5 away from the horizontal segment 6 is an arc-shaped mating surface that matches the radial outer periphery of the support ring 4, and the arc-shaped mating surface is fixedly connected to the radial outer periphery of the support ring 4.

[0066] Specifically, the radius of curvature of the arc-shaped mating surface matches the radius of curvature of the radial outer circumference of the support ring 4, allowing the arc-shaped mating surface to fit tightly against the radial outer circumference of the support ring 4. Since the outer circumference of the support ring 4 is a cylindrical surface, using a matching arc-shaped mating surface can significantly increase the contact area between the vertical section 5 and the support ring 4, making the load distribution at the connection more uniform and avoiding local stress concentration due to insufficient contact area.

[0067] The arc-shaped mating surface and the radial outer periphery of the support ring 4 are fixedly connected, which can be achieved by welding to fuse them together. When welding is used, the arc-shaped mating surface and the radial outer periphery of the support ring 4 are fused together to form a permanent connection between the vertical section 5 and the support ring 4, thereby improving the connection strength and ensuring a stable and reliable load transmission path from the support ring 4 to the adapter 3.

[0068] Example 4:

[0069] See Figures 3 to 6 Based on the above embodiments, this application provides a detachable connection structure between the adapter 3 and the support 1, which is different from a fixed connection.

[0070] Optionally, the end of the vertical segment 5 away from the horizontal segment 6 is a plane;

[0071] The support ring 4 has a lock box 8 on its radial outer periphery. The lock box 8 has a lock hole 9 that matches the vertical section 5 along its height direction. A spring 10 is provided in the lock hole 9. A positioning block 11 is connected to one end of the spring 10 near the vertical section 5. The positioning block 11 is slidably engaged with the lock hole 9.

[0072] The lock box 8 has a first pin hole 12 along its own thickness direction, and the first pin hole 12 is connected to the lock hole 9. The vertical section 5 has a second pin hole 13 corresponding to the first pin hole 12 along its own thickness direction.

[0073] Specifically, the lock box 8 is fixedly connected to the support ring 4, and its bottom is also an arc-shaped mating surface that matches the radial outer periphery of the support ring 4, increasing the connection area. The lock box 8 has a lock hole 9 along its height direction. The cross-sectional shape of the lock hole 9 matches the cross-sectional shape of the vertical section 5, allowing the vertical section 5 to be inserted into the lock hole 9. A spring 10 and a positioning block 11 are provided inside the lock hole 9. One end of the spring 10 is fixedly connected to the bottom of the lock hole 9, and the other end is fixedly connected to the positioning block 11. The outer periphery of the positioning block 11 is in sliding fit with the inner wall of the lock hole 9, allowing the positioning block 11 to reciprocate within the lock hole 9 along its height direction.

[0074] The lock box 8 has a first pin hole 12 along its thickness direction, which penetrates both side walls of the lock box 8 and communicates with the lock hole 9. The vertical section 5 has a second pin hole 13 along its thickness direction, the size of which corresponds to the size of the first pin hole 12, and when the vertical section 5 is inserted into the lock hole 9 to a predetermined position, the second pin hole 13 is aligned with the first pin hole 12.

[0075] During installation, insert the end of the vertical segment 5 furthest from the horizontal segment 6 (i.e., the flat end) into the lock hole 9 of the lock box 8. The vertical segment 5 pushes the positioning block 11 to compress the spring 10, and the positioning block 11 moves downward along the lock hole 9. When the vertical segment 5 is inserted until the second pin hole 13 is aligned with the first pin hole 12, insert the pin 14 into the first pin hole 12 and the second pin hole 13. The pin 14 locks the vertical segment 5 to the lock box 8, completing the detachable connection between the adapter 3 and the support ring 4. When disassembly is required, pull the pin 14 out of the first pin hole 12 and the second pin hole 13. The spring 10 automatically ejects the vertical segment 5 from the lock hole 9 through the positioning block 11, making it easy for the operator to remove the vertical segment 5 and achieving quick separation of the adapter 3 and the support ring 4.

[0076] During long-term operation of the equipment, the mating surfaces are prone to fretting corrosion due to vibration, or sticking due to the intrusion of dust and oil, causing the vertical section 5 to get stuck in the locking hole 9, resulting in a certain resistance to removal. With the spring 10 installed, during the insertion of the vertical section 5 into the locking hole 9, the spring 10 is compressed and accumulates elastic force. When the pin 14 is pulled out, the compression force of the spring 10 is released instantaneously, pushing the vertical section 5 outward from the locking hole 9 through the positioning block 11. This pushing force helps overcome the sticking resistance between the mating surfaces, reducing the difficulty of disassembly.

[0077] During long-term operation of the equipment, the adapter 3 and support ring 4 may deform due to accidental collisions or vibrations. If a traditional fixed connection structure is used, the adapter 3 and support ring 4 are welded or cast as a single unit. Damage to any part requires the entire support structure to be disassembled and replaced, resulting in the discarding of undamaged components and high spare parts costs. With the detachable connection scheme of this application, each component can be replaced independently: when the bearing is worn, it can be removed from the inner hole of the support ring 4 and replaced; when the support ring 4 is deformed, a new support ring 4 can be replaced and the support structure reinstalled; when the adapter 3 is deformed, the adapter 3 can be replaced and the support structure reinstalled. This process eliminates the need to discard undamaged parts, reducing spare parts consumption.

[0078] Furthermore, to allow the adapter 3 to connect to the frame, it needs to be designed in different shapes, such as L-shaped plates, U-shaped plates, or rectangular blocks, depending on the actual space. If a traditional fixed connection is used, different shapes of adapter 3 require different support components 1, resulting in poor versatility. This application addresses this by uniformly setting a standardized locking box 8 interface on the radial outer circumference of the support ring 4, allowing the same support ring 4 to accommodate various shapes of adapter 3. During installation, simply select an adapter 3 of the appropriate shape (L-shaped, U-shaped, or rectangular) according to the available space, lock one end to the locking box 8 on the support ring 4, and bolt the other end to the frame, thereby enhancing the applicability of the device.

[0079] It should be noted that adapters of different shapes can be replaced through the interface of the lock box 8 as long as the end of the adapter that mates with the lock box 8 is aligned with the insertion direction of the lock hole 9. The shape changes are mainly reflected in the extension path and turning method of the end of the adapter 3 away from the lock box 8.

[0080] Optionally, it also includes a pin 14 adapted to the first pin hole 12 and the second pin hole 13, wherein the end of the pin 14 away from its head has a radial through hole adapted to the cotter pin 15.

[0081] Specifically, the pin 14 is used to pass through the first pin hole 12 and the second pin hole 13 to lock the relative position of the lock box 8 and the vertical section 5. To prevent the pin 14 from axially shifting or even coming out due to vibration during equipment operation, the end of the pin 14 away from its head is provided with an anti-loosening structure. Specifically, the pin 14 adopts a cylindrical structure, with a head at one end having a diameter larger than the body of the pin 14. The head is easy for the operator to hold or for tools to clamp, and also serves as an axial limit to prevent the pin 14 from completely passing through the pin hole. The end of the pin 14 away from the head (i.e., the tail end) has a through hole in the radial direction, which penetrates the radial direction of the pin 14, and the diameter of the hole is adapted to the cotter pin 15.

[0082] During assembly, the pin 14 is inserted through the first pin hole 12, passes through the inside of the lock box 8, and then through the second pin hole 13 until the head of the pin 14 abuts against the outer end face of the first pin hole 12. At this time, the tail end of the pin 14 protrudes from the second pin hole 13. The cotter pin 15 is then inserted into the radial through hole at the tail end of the pin 14, and the tail of the cotter pin 15 is bent open to lock the pin 14 axially, preventing it from loosening due to equipment vibration. When disassembly is required, the bent end of the cotter pin 15 is straightened first, and the cotter pin 15 is pulled out from the radial through hole. Then, the pin 14 is pulled out from the pin hole. The entire locking and unlocking process does not damage any parts. The cotter pin 15 is reusable or replaceable, and the cost is low.

[0083] In this application, the cotter pin 15 is a standard cotter pin. Alternatively, the cotter pin 15 can also be an R-type cotter pin, and the pin shaft 14 can also be a ball-bearing quick-release pin.

[0084] Optionally, the opening edge of the lock hole 9 is provided with a first tapered guide surface 16, and the opening edge of the first pin hole 12 is provided with a second tapered guide surface 17.

[0085] Specifically, the opening end of the first conical guide surface 16 gradually narrows towards the inside of the lock hole 9, forming a trumpet-shaped structure. When the vertical section 5 is inserted into the lock hole 9, even if there is a certain positional deviation between the end of the vertical section 5 and the opening of the lock hole 9, the end of the vertical section 5 of the adapter 3 can slide into the lock hole 9 along the inclined surface of the first conical guide surface 16, and the insertion operation can be completed without precise alignment, reducing the assembly difficulty.

[0086] The opening edge of the first pin hole 12 is provided with a second tapered guide surface 17, which gradually narrows from the outer opening of the first pin hole 12 toward the inside of the hole. When the pin 14 is inserted into the first pin hole 12, the end of the pin 14 can be guided into the hole along the inclined surface of the second tapered guide surface 17, which facilitates the quick alignment and insertion of the pin 14. The guiding effect of the guide surface is more obvious, especially when the internal space of the lock box 8 is small and it is not convenient to directly observe the position of the pin hole.

[0087] Example 5:

[0088] Based on the above embodiments, optionally, the bearing component is a rolling bearing, and the inner ring of the rolling bearing is interference-fitted with the transmission shaft 2;

[0089] The rolling bearing is either a needle roller bearing or a deep groove ball bearing.

[0090] Specifically, during assembly, the inner ring of the rolling bearing can be pressed into the cantilever end of the drive shaft 2 using a press-fitting tool, or the inner ring can be heated and expanded using a temperature difference method before being fitted onto the drive shaft 2. After cooling, the inner ring shrinks, forming a tight interference fit with the drive shaft 2. This interference fit prevents relative rotation between the inner ring of the rolling bearing and the drive shaft 2, allowing the inner ring to rotate synchronously with the drive shaft 2. The outer ring of the rolling bearing is fixedly fitted to the inner hole of the support ring 4. Under normal operating conditions, the outer ring remains stationary, while the rolling elements roll between the inner and outer rings, achieving low-friction rotation of the drive shaft 2 within the support ring 4.

[0091] Based on the radial dimensions, load size, and installation space of drive shaft 2, either needle roller bearings or deep groove ball bearings can be selected as the rolling bearings. Needle roller bearings have a small radial cross-section, making them suitable for applications with limited radial space, and they also have a high load-bearing capacity. Deep groove ball bearings have a low coefficient of friction and a high limiting speed, making them suitable for applications with high speeds and requirements for smooth operation. Both types of bearings can meet the functional requirements of this solution, providing radial support to the cantilever end of drive shaft 2 and allowing drive shaft 2 to rotate around its own axis.

[0092] Example 6:

[0093] Based on the above embodiments, optionally, the bearing component is a sliding bearing, and the inner hole of the sliding bearing is clearance-fitted with the transmission shaft 2;

[0094] The sliding bearing is a sliding bushing.

[0095] Specifically, the sliding bearing is sleeve-shaped, with a clearance fit between its inner bore and the cantilever end of the drive shaft 2. This clearance fit allows the drive shaft 2 to rotate freely within the inner bore of the sliding bearing, and an oil film is formed between them through a lubricating medium, achieving low-friction operation. Compared to rolling bearings, sliding bearings have a simpler structure, smaller radial mounting dimensions, and produce less rolling element impact during operation, resulting in lower noise.

[0096] The sliding bearing specifically refers to a sliding bushing, which is made of wear-resistant materials such as copper alloys, powder metallurgy oil-impregnated materials, or engineering plastics. When using an oil-impregnated sliding bushing, lubricating oil is stored in the internal pores of the bushing. During operation, the lubricating oil seeps out to form a self-lubricating oil film, eliminating the need for additional lubrication devices and simplifying maintenance. When the sliding bushing wears out due to long-term use, it can be directly removed from the inner hole of the support ring 4 and replaced with a new bushing, resulting in low replacement costs and convenient operation.

[0097] Example 7:

[0098] Based on the above embodiments, this application provides an installation method applied to the drive shaft support structure described above, the method comprising:

[0099] S1, connect one end of the adapter 3 to the radial outer side of the support 1;

[0100] S2, rotate the support member 1 onto the cantilever end of the transmission shaft 2, and make the central axis of the support member 1 coincide with the axis of the transmission shaft 2;

[0101] S3, adjust the axial position of the support 1 on the transmission shaft 2 so that the other end of the adapter 3 is aligned with the reserved installation position on the frame of the high-speed hard-pack cigarette packaging machine;

[0102] S4, adjust the circumferential position of the support 1 on the transmission shaft 2 so that the other end of the adapter 3 gradually approaches the frame of the high-speed hard-pack cigarette packaging machine until it fits the reserved installation position;

[0103] S5, screw in the locking fastener to connect and lock the adapter 3 to the frame of the high-speed hard-pack cigarette packaging machine.

[0104] Specifically, in step S1, depending on the actual connection method used, if it is a fixed connection scheme, one end of the adapter 3 can be fixed to the outer periphery of the support 1 by welding; if it is a detachable connection scheme, one end of the adapter 3 can be inserted into the locking box 8 on the radial outer periphery of the support 1 and locked by the pin 14. After the connection is completed, the adapter 3 and the support 1 form an integral component, which facilitates subsequent overall assembly.

[0105] In step S2, the support member 1 from the assembly formed in step S1 is fitted onto the cantilever end of the drive shaft 2. During fitting, the central axis of the support member 1 is aligned with the axis of the drive shaft 2 to ensure coaxial installation. The support member 1 and the drive shaft 2 are in a rotatable fit, and after fitting, the drive shaft 2 can still rotate freely around its own axis within the support member 1.

[0106] In step S3, the support member 1 is slidably axially along the drive shaft 2 to adjust its axial position. The goal of the adjustment is to move the support member 1 to the weakest stress section at the cantilever end, so that the end of the adapter 3 used for connecting to the frame is aligned with the reserved installation position on the frame of the high-speed hard-pack cigarette packaging machine. This reserved installation position has its own screw hole. After axial adjustment, the waist hole 7 or through hole at this end of the adapter 3 should be aligned axially with the screw hole on the frame to facilitate the subsequent installation of fasteners.

[0107] In step S4, the support member 1 is rotated on the drive shaft 2 to adjust its circumferential position. The goal of the rotation is to gradually bring the end of the adapter 3 that connects to the frame closer to the pre-reserved mounting position on the frame until that end face is in contact with the frame surface. Since the relative position between the adapter 3 and the frame is determined after they are in contact, the circumferential adjustment also calibrates the fit of the adapter 3. This step can be performed concurrently with step three, meaning that axial and circumferential adjustments can be made repeatedly until the adapter 3 is both aligned and in contact with the frame.

[0108] In step S5, after the adapter 3 is fitted with the frame and the slot 7 is aligned with the screw hole, the locking fastener (e.g., a bolt) is passed through the slot 7 on the adapter 3, screwed into the screw hole on the frame, and tightened. After the fastener is tightened, the adapter 3 is fixed to the frame, and the entire support assembly is locked. The axial and circumferential positions of the support 1 on the drive shaft 2 are also fixed. The installation is now complete.

[0109] Further, before step S1, first identify the weak stress section of the drive shaft 2 due to excessive cantilever or span. This section is typically located between the outer pulley and the adjacent support point. Simultaneously, confirm the reserved installation position on the frame of the high-speed hard-pack cigarette packaging machine, which has its own screw hole. Based on the spatial relationship between the weak stress section and the reserved installation position, select an adapter 3 of suitable size and shape. The goal of installation is to position the support 1 at the weak stress section of the cantilever end of the drive shaft 2 and connect the support 1 to the reserved installation position via the adapter 3. When the waist hole 7 is aligned axially with the screw hole on the frame, the support 1 is precisely located in the weak stress section; or, when the support 1 is axially slid to the weak stress section, the waist hole 7 is precisely aligned axially with the screw hole on the frame.

[0110] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A drive shaft support structure of a coaxial multi-toothed pulley mechanism, comprising a high-speed hard-box cigarette packer group frame, characterized in that, Also includes: The support member (1) is sleeved on the cantilever end of the transmission shaft (2), and its central axis coincides with the axis of the transmission shaft (2) and is rotatably engaged with the transmission shaft (2) to allow the transmission shaft (2) to rotate around its own axis. The adapter (3) has one end located on the radial outer side of the support (1) and the other end detachably connected to the frame of the high-speed hard-pack cigarette packaging machine, so that a bridge is formed between the support (1) and the frame.

2. The coaxial multi- cog belt wheel mechanism's transmission shaft support structure according to claim 1, characterized by, The support member (1) includes: The support ring (4) has a bearing component coaxially mounted in its inner hole, and the outer ring of the bearing component is fixedly fitted with the inner hole of the support ring (4), and the inner ring of the bearing component is fitted with the cantilever end of the transmission shaft (2). The fixed fit is either an interference fit or a transition fit.

3. The transmission shaft support structure of the coaxial multi-toothed pulley mechanism according to claim 2, characterized in that, The adapter (3) includes: The vertical section (5) is connected at one end to the radial outer periphery of the support ring (4) and at the other end to the horizontal section (6), which extends away from the vertical section (5) to form an L-shaped structure. The horizontal section (6) has a waist hole (7) along its thickness direction, and there are two waist holes (7) along the length direction of the horizontal section (6) so that the horizontal section (6) can be connected to the frame of the high-speed hard-pack cigarette packaging machine through the waist hole (7) and bolts.

4. The transmission shaft support structure of the coaxial multi-toothed pulley mechanism according to claim 3, characterized in that, The end of the vertical segment (5) away from the horizontal segment (6) is an arc-shaped mating surface that matches the radial outer periphery of the support ring (4), and the arc-shaped mating surface is fixedly connected to the radial outer periphery of the support ring (4).

5. The transmission shaft support structure of the coaxial multi-toothed pulley mechanism according to claim 3, characterized in that, The end of the vertical segment (5) away from the horizontal segment (6) is a plane; The support ring (4) has a lock box (8) on its radial outer periphery. The lock box (8) has a lock hole (9) that matches the vertical section (5) along its height direction. A spring (10) is provided in the lock hole (9). A positioning block (11) is connected to one end of the spring (10) near the vertical section (5), and the positioning block (11) slides with the lock hole (9). The lock box (8) has a first pin hole (12) along its own thickness direction, and the first pin hole (12) is connected to the lock hole (9). The vertical section (5) has a second pin hole (13) corresponding to the first pin hole (12) along its own thickness direction.

6. The transmission shaft support structure of the coaxial multi-toothed pulley mechanism according to claim 5, characterized in that, It also includes a pin (14) adapted to the first pin hole (12) and the second pin hole (13), wherein the pin (14) has a radial through hole adapted to the cotter pin (15) at one end away from its head.

7. The transmission shaft support structure of the coaxial multi-toothed pulley mechanism according to claim 6, characterized in that, The opening edge of the lock hole (9) is provided with a first tapered guide surface (16), and the opening edge of the first pin hole (12) is provided with a second tapered guide surface (17).

8. The transmission shaft support structure of the coaxial multi-toothed pulley mechanism according to claim 2, characterized in that, The bearing component is a rolling bearing, and the inner ring of the rolling bearing is interference-fitted with the transmission shaft (2); The rolling bearing is either a needle roller bearing or a deep groove ball bearing.

9. The transmission shaft support structure of the coaxial multi-toothed pulley mechanism according to claim 2, characterized in that, The bearing component is a sliding bearing, and the inner hole of the sliding bearing is clearance-fitted with the transmission shaft (2); The sliding bearing is a sliding bushing.

10. An installation method, characterized in that, The method, applied to the drive shaft support structure as described in any one of claims 1 to 9, comprises: S1, connect one end of the adapter (3) to the radial outer side of the support (1); S2, rotate the support member (1) onto the cantilever end of the transmission shaft (2) and make the central axis of the support member (1) coincide with the axis of the transmission shaft (2); S3, adjust the axial position of the support (1) on the transmission shaft (2) so that the other end of the adapter (3) is aligned with the reserved installation position on the frame of the high-speed hard-pack cigarette packaging machine; S4, adjust the circumferential position of the support (1) on the transmission shaft (2) so that the other end of the adapter (3) gradually approaches the frame of the high-speed hard-pack cigarette packaging machine until it fits the reserved installation position; S5, screw in the locking fastener to connect and lock the adapter (3) to the frame of the high-speed hard-pack cigarette packaging machine.

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