Motorcycle sprocket tooth surface automatic polishing processing device and method thereof

Abstract

This invention relates to the field of sprocket tooth surface polishing technology, specifically to an automatic polishing device and method for motorcycle sprocket teeth. The device includes a frame, a partition plate installed in the center of the frame's inner cavity, the partition plate having a perforated gap, a mounting seat installed on the top surface of the partition plate, and a sprocket with controlled intermittent rotation mounted on the mounting seat. A drive gear with controlled rotation and movement is located on the right side of the frame's inner cavity, meshing with the sprocket. A mechanical oscillating polishing mechanism is located on the left side of the frame's inner cavity. This mechanical oscillating polishing mechanism uniformly polishes the tooth tips, tooth profiles, and tooth root dead corners, effectively avoiding the problems of insufficient tooth root polishing and excessive rounded corner polishing of traditional fixed polishing wheels, thus improving the uniformity and forming accuracy of sprocket tooth surface polishing.

Description

Technical Field

[0001] This invention relates to the field of sprocket tooth surface polishing technology, and more specifically to an automatic polishing device and method for motorcycle sprocket teeth. Background Technology

[0002] Motorcycle sprockets are specialized meshing gear components for roller chain drives. They mainly consist of a small front-end driving sprocket and a large rear-end driven sprocket. These two sprockets are matched and assembled with the drive chain to form the motorcycle's power chain transmission system. These sprockets use involute tooth profiles or chain-drive-specific tooth profiles as their working tooth shape. They are manufactured through forging or stamping, precision machining, and overall heat treatment with quenching and strengthening processes. They are core and critical components of the motorcycle's power transmission system.

[0003] After machining and heat treatment, motorcycle sprockets often retain machining marks, burrs, oxide scale, and microscopic protrusions at the tooth tips, profiles, and roots. Therefore, a complete polishing process is necessary to finish the sprocket teeth. Polishing thoroughly removes burrs and sharp edges from all parts of the teeth, effectively preventing burrs from scratching the chain rollers and bushings during sprocket operation. It also prevents burrs from falling off and forming hard abrasive particles, thus preventing wear and tear on the sprocket and chain.

[0004] Currently, most of the finishing equipment used in the industry for motorcycle sprocket teeth is the traditional fixed grinding and polishing machine, which mainly relies on a polishing wheel with a fixed posture to grind and polish the sprocket teeth. This polishing method has obvious process defects. The fixed posture of the polishing wheel results in insufficient polishing force and uneven polishing in the narrow tooth root area. In order to ensure that the tooth root polishing meets the standards, the tooth tip is often over-polished, resulting in excessively large tooth tip radius and tooth shape distortion. This seriously reduces the overall polishing accuracy and product qualification rate of the sprocket, and cannot meet the needs of high-precision mass polishing processing of sprockets.

[0005] To address the aforementioned issues, there is an urgent need to develop an automatic polishing device and method for motorcycle sprocket teeth. This device is equipped with a mechanical oscillating polishing mechanism that performs uniform polishing of the sprocket tooth tips, profiles, and roots, effectively solving the processing drawbacks of traditional equipment and improving the polishing precision and processing consistency of sprockets. Summary of the Invention

[0006] In response to the problems raised in the background art, the present invention provides an automatic polishing device and method for motorcycle sprocket teeth, which will be further described below.

[0007] An automatic polishing device for motorcycle sprocket teeth includes a frame, a partition installed in the middle of the inner cavity of the frame, the partition having a hollowed-out gap, a mounting seat installed on the top surface of the partition, a sprocket with controlled intermittent rotation on the mounting seat, a drive gear with controlled rotation and movement on the right side of the inner cavity of the frame, the drive gear meshing with the sprocket, and a mechanical oscillating polishing mechanism on the left side of the inner cavity of the frame.

[0008] Preferably, the mechanical oscillating polishing mechanism includes a movable plate that slides laterally within the inner cavity of the frame, a rotating shaft that slides through the middle of the movable plate, and a wire wheel that is keyed to the front end of the rotating shaft.

[0009] Preferably, an electric slide rail is installed on the rear side of the inner cavity of the frame, a slide block is slidably connected to the electric slide rail, a motor is installed on the slide block, a cross shaft is keyed to the output shaft of the motor, the cross shaft and the rear end of the rotating shaft are embedded and slidably connected, a center wheel and a turntable are fixedly connected to the outer periphery of the rotating shaft, and multiple circumferentially evenly distributed connecting columns are detachably connected to the turntable, each connecting column having a cam at its end, and multiple positioning frames are detachably connected to the moving plate, each positioning frame corresponding to and slidingly engaging with the connecting columns. The movable plate is detachably connected to three circumferentially evenly arranged tripods on its rear side. A short shaft is connected to each tripod, and a transmission wheel is keyed to each short shaft. The three sets of transmission wheels simultaneously mesh with the central wheel. A turntable is connected to all three sets of tripods. A gear ring is fixedly connected to the inner side of the turntable. The gear ring simultaneously meshes with the three transmission wheels. The number of teeth on the transmission wheels is greater than the number of teeth on the central wheel, and the number of teeth on the gear ring is greater than the number of teeth on the transmission wheels. An annular wave groove is opened on one end face of the turntable, and the cam is embedded and slidably connected to the wave groove.

[0010] Preferably, each of the tripods has two sets of symmetrically arranged limiting balls on its inner side, and the limiting balls slide against one end face of the turntable.

[0011] Preferably, a bracket is fixed to the front side of the movable plate, and a protective sleeve is installed on the bracket. The protective sleeve is sleeved on the outer side of the front end of the rotating shaft and slides in cooperation with the rotating shaft.

[0012] Preferably, a baffle plate 1 and a baffle plate 2 are fixedly connected to the rear side of the inner cavity of the frame, and a movable plate is slidably connected between the baffle plate 1 and the baffle plate 2, with the lateral length of the movable plate being extended for redundancy.

[0013] Preferably, a support is installed on the front side of the second baffle, a second motor is installed on the support, a swing arm is keyed to the output shaft of the second motor, a third motor is installed on the swing arm, a drive gear is keyed to the output shaft of the third motor, a conical seat is installed on the top surface of the mounting base, a support frame is fixedly connected to the top of the conical seat, two horizontal grooves and two vertical grooves are evenly opened in a cross pattern on the support frame, guide frames are fixedly connected to the bottom of the horizontal grooves and vertical grooves, a sliding plate is vertically slidably connected inside the vertical groove, a storage spring is provided between the sliding plate and the corresponding side guide frame, the two sliding plates are symmetrically arranged, a pressing block is fixedly connected to the outer wall of the sliding plate, a fourth motor is installed in the inner cavity of the conical seat, a connecting shaft is keyed to the output shaft of the fourth motor, the connecting shaft vertically passes through the axis of the conical seat and the support frame and rotates in cooperation, a rectangular columnar rotating column is keyed to the top of the connecting shaft, and two sets of sliding plates symmetrically abut against the short sides of the rotating column.

[0014] Preferably, a polishing brush head is slidably connected to the bottom guide frame of the transverse groove, and a return spring is provided between the polishing brush head and the corresponding guide frame. The two polishing brush heads are symmetrically abutted against the outer side of the long side of the rotating column.

[0015] Preferably, a fan is fixedly installed at the top of the frame, and two switch doors are connected to the front side of the frame.

[0016] The automatic polishing method for motorcycle sprocket teeth is as follows:

[0017] Step 1: Power on the equipment and put it into standby mode. The second motor drives the swing arm to rise, keeping the drive gear in the outer clearance position. The wire wheel is in the clearance position, and the door is opened to facilitate the assembly of workpieces and consumables.

[0018] Step 2: Place the sprocket to be processed on the conical seat of the mounting base to complete the initial positioning.

[0019] Step 3: Start the motor to drive the rotating column to rotate, so that the short side of the rotating column presses against the sliding plates on both sides, overcoming the elastic force of the storage spring and causing the sliding plates to expand outward, driving the pressing block to press against the inner ring of the sprocket, completing the centering of the sprocket and fixing it with the rigid inner support. At this time, the polishing brush head is in the inward avoidance position and does not contact the inner ring of the sprocket.

[0020] Step four: Start the second motor to drive the swing arm to swing down, which drives the drive gear to move and mesh with the outer teeth of the sprocket. The third motor is locked and stationary. The gear meshing self-locking restricts the sprocket's rotation, forming a double fixed state of inner support and outer lock.

[0021] Step 5: Start the electric slide rail. The slide block drives the motor, cross shaft, rotating shaft, moving plate and wire wheel forward as a whole, so that the wire wheel enters the sprocket tooth surface polishing station.

[0022] Step 6: Start motor 1 to drive the wire wheel to rotate at high speed, which in turn drives the center wheel and turntable 2 to rotate at high speed. After two-stage reduction by the transmission wheel and gear ring, the turntable 1 rotates at low speed. Through the wave groove and cam linkage, the wire wheel produces a small axial periodic oscillation, which polishes the tips, profiles and roots of the sprocket teeth at the current workstation in an all-round and uniform manner, removing burrs, oxide scale and micro protrusions.

[0023] Step 7: After polishing a single set of tooth surfaces, the electric slide rail drives the wire wheel to retract and move to a safe position. Start motor 3 and rotate it at a low speed to drive the sprocket tooth surface to rotate intermittently. Switch the next tooth surface to be polished to the polishing station, stop motor 3, lock the drive gear again, and repeat the polishing process until all external teeth are polished.

[0024] Step 7: After all the outer teeth are polished, keep the sprocket intact and start the motor to drive the rotating column to change direction. This will cause the long side of the rotating column to correspond to the sliding plate and the short side to squeeze the polishing brush head. The sliding plate will retract and reset under the action of the storage spring, and the squeezing block will release the inner ring limit. At the same time, the polishing brush head will expand outward to fit and press against the inner ring of the sprocket.

[0025] Step 8: Start motor 3 and run it at high speed of speed 2. This will drive the drive gear and sprocket to rotate at high speed. Through the relative friction between the inner ring of the sprocket and the polishing brush head, the polishing operation of the entire inner ring of the sprocket will be completed.

[0026] Step nine: After all polishing is completed, each mechanism is reset in sequence. The polishing brush head and extrusion block are all out of position, the drive gear swings out of position, the wire wheel retracts and resets, the switch door is opened, the polished sprocket is taken out, and the equipment returns to standby mode, waiting for the next processing.

[0027] Beneficial effects: The mechanical adaptive oscillating polishing mechanism of this device, through a reduction mechanism consisting of a motor, a central wheel, a transmission wheel, and a gear ring, and in conjunction with a turntable, a wave groove, and a cam linkage, causes the wire wheel to generate periodic small axial oscillations while rotating at high speed, uniformly polishing the tooth tips, tooth profiles, and tooth root dead corners. This effectively avoids the problems of insufficient polishing of tooth roots and excessive polishing of tooth tips with rounded corners in traditional fixed polishing wheels, thus improving the polishing uniformity and forming accuracy of the sprocket tooth surface.

[0028] The inner ring is elastically supported and positioned by the pressing block, sliding plate and energy storage spring at the top of the mounting base, and is locked and limited by the meshing of the outer drive gear. During the polishing process, the sprocket has no self-rotation, no deviation and no shaking.

[0029] The four-wheel drive rotating column can automatically switch between the "external tooth polishing and internal support positioning state" and the "inner ring polishing brush head contact state" through the motor-driven rotation column posture switching. When polishing the external teeth, the polishing brush head automatically retracts to avoid the position, and when polishing the inner ring, the extrusion block automatically retracts to relieve the force. No secondary clamping or workpiece transfer is required, and the burr, oxide scale and inner ring hole wall polishing of the sprocket external teeth and the inner ring hole wall can be completed in one go.

[0030] By controlling the drive gears with motor 2 for overall positioning and meshing feed, and controlling the sprocket teeth to rotate intermittently with motor 3, and cooperating with the electric slide rail for automatic entry and exit from the work station, the entire process of automatic tool setting, automatic polishing, automatic gear changing, and automatic reset is realized, which greatly improves processing efficiency and reduces manual labor intensity. Attached Figure Description

[0031] Figure 1 : A three-dimensional structural schematic diagram of the present invention;

[0032] Figure 2 : A schematic diagram of the structure of components such as baffle one, baffle two, and sprocket of the present invention;

[0033] Figure 3 : A schematic diagram of the mechanical oscillating polishing mechanism of the present invention;

[0034] Figure 4 : A schematic diagram of the structure of the motor, cross shaft, rotating shaft and other components of this invention;

[0035] Figure 5 : A schematic diagram of the structure of the toothed ring, turntable 1, wave groove and other components of this invention;

[0036] Figure 6 : A schematic diagram of the structure of the bracket, protective sleeve, movable plate and other components of this invention;

[0037] Figure 7 : A schematic diagram of the structure of the rotating column, sliding plate, pressing block and other components of this invention;

[0038] Figure 8 : A schematic diagram of the structure of the guide frame, vertical groove, horizontal groove and other components of this invention;

[0039] In the diagram: 1-Frame, 11-Fan, 12-Door switch, 13-Slide block, 14-Motor 1, 141-Cross shaft, 142-Rotating shaft, 15-Wire wheel, 16-Mounting base, 17-Electric slide rail, 18-Baffle, 19-Drive gear, 2-Baffle 1, 201-Baffle 2, 20-Sprocket, 21-Moving plate, 22-Triangle bracket, 23-Short shaft, 24-Positioning bracket, 25-Transmission wheel, 26-Limit ball, 27-Gear ring, 28-Turntable 1. 29-Wave groove, 3-Center wheel, 31-Turntable 2. 32-Connecting column, 33-Cam, 34-Bracket, 35-Protective sleeve, 4-Conical seat, 41-Motor 4. 42-Support frame, 43-Connecting shaft, 44-Rotating column, 45-Sliding plate, 46-Extrusion block, 47-Storage spring, 48-Guide frame, 49-Vertical groove, 5-Support, 51-Swing arm, 52-Motor 2, 53-Motor 3, 54-Horizontal groove, 55-Polishing brush head. Detailed Implementation

[0040] Next, combine Figures 1-8 A specific embodiment of the present invention will be described in detail below.

[0041] refer to Figure 1 and Figure 2 An automatic polishing device for motorcycle sprocket teeth includes a frame 1. A partition 18 is detachably installed in the middle of the inner cavity of the frame 1. The partition 18 has evenly spaced slots to facilitate dust collection. A mounting seat 16 is installed on the top surface of the partition 18. A sprocket 20 with controlled intermittent rotation is mounted on the mounting seat 16. The mounting seat 16 is used for positioning and clamping the sprocket 20 and rotating it in the workstation. A drive gear 19 with controlled rotation and movement is provided on the right side of the inner cavity of the frame 1. The drive gear 19 meshes with the sprocket 20, driving the sprocket 20 to rotate intermittently through gear meshing, so that each tooth surface of the sprocket 20 enters the polishing station in turn to complete the multi-tooth continuous polishing operation. A mechanical oscillating polishing mechanism is provided on the left side of the inner cavity of the frame 1. The mechanical oscillation fits the tooth shape of the sprocket 20 and polishes the tooth tip, tooth profile and tooth root of the sprocket 20 evenly, solving the defects of uneven tooth root polishing and easy over-polishing of tooth tip in traditional polishing equipment.

[0042] In the initial standby state of the equipment, the drive gear 19 remains in an outward-facing position and does not mesh with the sprocket 20 above the mounting base 16. There is no structural interference, which makes it easy for manual or robotic arms to position and clamp the sprocket 20 to be polished on the mounting base 16, thus completing the stable loading and positioning of the workpiece. After loading, the drive gear 19 moves and meshes with the sprocket 20, using the self-locking characteristic of gear meshing to restrict the rotation of the sprocket 20.

[0043] Single tooth polishing process: After the sprocket 20 is clamped and fixed, the mechanical oscillating polishing mechanism is started to fit the tooth profile of the sprocket and perform all-round uniform polishing on the tooth surface, tooth profile and tooth root of the current station to remove burrs, oxide scale and micro protrusion defects on the tooth surface, and complete the polishing operation of a single set of gear teeth.

[0044] After single-tooth polishing is completed, the mechanical oscillating polishing mechanism moves to a safe position, driving gear 19 to engage with the teeth of sprocket 20. Through gear transmission, sprocket 20 is driven to rotate intermittently on mounting base 16, precisely switching the next unpolished tooth to the center position of the polishing station. After switching, drive gear 19 and sprocket 20 remain engaged and stationary, utilizing the self-locking characteristic of gear meshing to restrict the rotation of sprocket 20, ensuring that sprocket 20 does not deviate or rotate during polishing, guaranteeing the stability of the polishing station. The mechanical oscillating polishing mechanism is then restarted to uniformly polish the new tooth surface.

[0045] Repeat the above process of "single tooth polishing, gear rotation and tooth changing, locking and positioning polishing" to complete the uniform polishing of all teeth of sprocket 20 in sequence, so as to achieve consistent processing of all tooth surfaces, tooth roots and tooth tips.

[0046] After the entire polishing operation of sprocket 20 is completed, the mechanical swing polishing mechanism moves to a safe position, the drive gear 19 disengages from sprocket 20 again and returns to the outer safe position, the meshing limit of sprocket 20 is released, and the worker can directly remove the polished sprocket 20 from the mounting base 16 to complete the fully automatic polishing process of a single workpiece. The equipment is then reset and put into standby mode, waiting for the next batch of workpieces to be processed.

[0047] refer to Figure 2 and Figure 3 The mechanical oscillating polishing mechanism includes a movable plate 21 that slides laterally within the inner cavity of the frame 1. A rotating shaft 142 is slidably connected through the middle of the movable plate 21, and a wire wheel 15 is keyed to the front end of the rotating shaft 142.

[0048] refer to Figure 4 An electric slide rail 17 is installed on the rear side of the inner cavity of the frame 1. A slide block 13 is slidably connected to the electric slide rail 17. A motor 14 is installed on the slide block 13. A cross shaft 141 is keyed to the output shaft of the motor 14. The rear ends of the cross shaft 141 and the rotating shaft 142 are embedded and slidably connected, so that the rotating shaft 142 can both rotate synchronously with the cross shaft 141 in the circumferential direction and slide slightly along the cross shaft 141 in the axial direction, thus realizing synchronous rotation and axial sliding.

[0049] During polishing, the electric slide rail 17 is started, which drives the slide block 13 to move laterally. Simultaneously, the motor 14, cross shaft 141, rotating shaft 142, moving plate 21 and wire wheel 15 move laterally as a whole. This allows the wire wheel 15 to move to the polishing station to complete the tool setting, or to automatically retreat to avoid the position after polishing, thus reserving operating space for the sprocket 20 to rotate and load / unload materials.

[0050] When the wire wheel 15 carries the abrasive into the polishing station, the motor 14 is started. The motor 14 drives the rotating shaft 142 and the wire wheel 15 to rotate at high speed through the cross shaft 141. The polishing abrasive wrapped around the outer periphery is used to polish the tooth surface of the sprocket 20 at high speed to remove the tooth surface marks, burrs, oxide scale and micro protrusion defects.

[0051] During this process, the drive gear 19 and the sprocket 20 remain engaged. The self-locking characteristic of the gear engagement restricts the rotation of the sprocket 20, ensuring that the sprocket 20 does not deviate or rotate during the polishing process, thus guaranteeing the stability of the polishing station.

[0052] To enable the wire wheel 15 to perform regular small-amplitude reciprocating oscillations while grinding at high speed, and to achieve uniform polishing of the tooth root, tooth profile, and tooth tip, this device is designed as follows.

[0053] refer to Figures 3-5The rotating shaft 142 is fixedly connected to a central wheel 3 and a turntable 31. The turntable 31 is detachably connected to a plurality of circumferentially evenly distributed connecting columns 32. Each connecting column 32 is connected to a cam 33 at its end. The moving plate 21 is detachably connected to a plurality of positioning frames 24. The positioning frames 24 correspond one-to-one with the connecting columns 32 and slide in cooperation. The positioning frames 24 can guide and assist in the movement trajectory of the connecting columns 32 and the cams 33, ensuring stable transmission operation without deviation or jamming.

[0054] The movable plate 21 is detachably connected to three circumferentially evenly arranged tripods 22. Each tripod 22 has a short shaft 23 connected to it, and a transmission wheel 25 is keyed to the short shaft 23. All three sets of transmission wheels 25 simultaneously mesh with the central wheel 3. A turntable 28 is connected to all three sets of tripods 22. Each tripod 22 has two sets of symmetrically arranged limiting balls 26 connected to its inner side. The limiting balls 26 slide against the end face of the turntable 28, providing multi-point suspension support for the turntable 28. This ensures smooth, unimpeded rotation of the turntable 28 and limits its movement, improving overall structural stability.

[0055] A gear ring 27 is fixedly connected to the inner side of the turntable 28. The gear ring 27 meshes with three transmission wheels 25 simultaneously. This structure adopts a large reduction ratio design, that is, the number of teeth of the transmission wheel 25 is greater than the number of teeth of the center wheel 3, and the number of teeth of the gear ring 27 is greater than the number of teeth of the transmission wheel 25, forming a multi-stage reduction transmission structure.

[0056] The turntable 28 has an annular wave groove 29 on its end face. The cam 33 is embedded and slidably connected to the wave groove 29. The cam 33's motion posture is constrained by the curved trajectory of the wave groove 29, and the low-speed rotation of the turntable 28 is converted into the periodic reciprocating deflection oscillation of the cam 33.

[0057] The complete linkage process of this mechanical oscillating polishing mechanism:

[0058] During the polishing stage of sprocket 20, the right-side drive gear 19 remains in an outward-facing position and does not mesh with sprocket 20, ensuring that the workpiece is mounted on the mounting base 16 without obstruction. After the workpiece is stably loaded and positioned, the drive gear 19 moves and meshes with sprocket 20, using the self-locking characteristic of gear meshing to restrict the rotation of sprocket 20.

[0059] Start the electric slide rail 17, which drives the slide block 13 to move, thereby driving the motor 14, the rotating shaft 142, the moving plate 21 and the wire wheel 15 to move synchronously, so that the wire wheel 15 enters the polishing station of the sprocket 20 tooth surface.

[0060] Then, motor 14 is started, which drives shaft 142, wire wheel 15, center wheel 3 and turntable 2 31 to rotate synchronously at high speed through cross shaft 141. The high-speed rotating center wheel 3 drives three sets of transmission wheels 25 to mesh and rotate synchronously. The first-level reduction is achieved by relying on the difference in the number of teeth between the center wheel 3 and the transmission wheel 25. The three sets of transmission wheels 25 drive the outer gear ring 27 to mesh and rotate synchronously. The second-level reduction is achieved by relying on the difference in the number of teeth between the transmission wheel 25 and the gear ring 27. Finally, the turntable 28 is driven to rotate at a low speed, stably and uniformly.

[0061] The low-speed rotating turntable 28 drives the end face wave groove 29 to rotate synchronously. The wave curve trajectory of the wave groove 29 squeezes the cam 33, causing the high-speed rotating cam 33 to produce periodic and regular small back-and-forth oscillations. The cam 33 drives the turntable 31 to oscillate synchronously and slightly back and forth through the connecting column 32, which in turn drives the rotating shaft 142 to slide slightly back and forth along the cross shaft 141 axis. Finally, the wire wheel 15 achieves mechanical periodic back-and-forth oscillation motion while rotating and grinding at high speed.

[0062] This composite motion mode allows the polishing abrasive on the wire wheel 15 to adaptively conform to the irregular tooth profile of the sprocket. It can uniformly grind the tooth tips and profiles, and also perform fine polishing in the dead corners of the tooth roots, solving the industry pain points of uneven tooth root polishing and excessive rounding of tooth tips caused by traditional fixed polishing wheels. At the same time, when the wire wheel 15 swings to grind a single tooth surface of the sprocket 20 on one side, a gap is automatically formed on the other side. The metal chips generated during grinding can fall naturally through this gap and fall into the bottom of the frame 1 through the hollow gap of the partition 18, realizing automatic chip collection and avoiding chip accumulation that affects polishing accuracy.

[0063] refer to Figure 6 Considering that the polishing and grinding process of sprocket 20 will continuously generate a large amount of metal debris and fine dust, large debris can fall naturally to the bottom of the frame 1 through the slots in the partition 18 under its own weight and be collected; however, suspended fine dust cannot settle on its own and is very easy to accumulate in the transmission area of ​​the equipment. Dust accumulation will not only adhere to the surfaces of gears, transmission wheels 25, and oscillating linkage structures, causing jamming, wear, and reduced transmission accuracy, but in severe cases, it may also cause a dust explosion risk, posing a great safety hazard. To this end, a bracket 34 is fixedly connected to the front side of the movable plate 21, and a protective sleeve 35 is installed on the bracket 34. The protective sleeve 35 is sleeved on the outer side of the front end of the rotating shaft 142 and slides in cooperation with the rotating shaft 142, forming a full-enclosed dynamic protection for the area through which the rotating shaft 142 passes. The protective sleeve 35 can prevent polishing dust from entering the mating gap of the rotating shaft 142 and the transmission area of ​​the cross shaft 141 without interfering with the high-speed rotation and axial reciprocating sliding of the rotating shaft 142, thus avoiding dust from entering the moving pair and causing jamming, abnormal wear and transmission failure.

[0064] refer to Figure 3The frame 1 has a baffle 2 and a baffle 201 fixedly connected to the rear side of the inner cavity. The movable plate 21 is slidably connected between the baffle 2 and the baffle 201. The baffle 2, the baffle 201 and the movable plate 21 together form an integral closed isolation sealing plate structure, which completely isolates the front polishing work station from the rear rotating shaft 142, the transmission wheel 25, the swing and all other transmission components.

[0065] The movable plate 21 features an extended and redundant lateral length design, ensuring that it remains fully overlapped and sealed with the side baffles 2 and 201 throughout its lateral sliding stroke, with no gaps or open areas. This completely prevents polishing dust from diffusing backward into the transmission cavity, guaranteeing a dust-free, contamination-free, and stable operation of the rear precision transmission structure.

[0066] refer to Figure 1 A fan 11 is fixedly installed at the top of the frame 1. The fan 11 is directed to the polishing operation area inside the frame 1 to draw air in a directional manner. It can draw away the suspended fine dust in the cavity by directional negative pressure, and promptly remove the dust accumulated inside the equipment, further reducing the dust concentration in the cavity, eliminating the equipment failure and dust explosion safety hazards caused by dust accumulation, and ensuring a clean polishing operation environment and stable long-term operation of the equipment.

[0067] refer to Figure 2 , Figure 7 and Figure 8 A support 5 is installed on the front side of the baffle 201. A motor 2 52 is installed on the support 5. A swing arm 51 is keyed to the output shaft of the motor 2 52. A motor 3 53 is installed on the swing arm 51. A drive gear 19 is keyed to the output shaft of the motor 3 53. The swing arm 51 can be driven to swing as a whole by the motor 2 52, so as to realize the movement and positioning of the drive gear 19. The drive gear 19 can be driven to rotate independently by the motor 3 53, so as to provide a power source for the tooth surface switching of the sprocket 20.

[0068] During the assembly of sprocket 20, the swing arm 51 is in a raised, off-center position, and the drive gear 19 is completely away from the mounting base 16, with no meshing interference, ensuring that sprocket 20 can be smoothly assembled above the mounting base 16. After the sprocket 20 is assembled and positioned, the second motor 52 is started to drive the swing arm 51 to swing down, which in turn drives the third motor 53 and the drive gear 19 to move horizontally together, so that the drive gear 19 meshes with the outer teeth of the sprocket 20.

[0069] After the gears are engaged, the electric slide rail 17 is activated, driving the slide block 13, motor 14, cross shaft 141, rotating shaft 142, moving plate 21, and wire wheel 15 to move laterally as a whole, so that the wire wheel 15 enters the polishing position of the sprocket 20 tooth surface. Then, the mechanical oscillating polishing mechanism is activated to perform single-tooth polishing. Throughout the polishing process, motor 53 remains locked and stationary, and the drive gear 19 maintains a fixed posture. The self-locking characteristic of gear meshing restricts the rotation of the sprocket 20, preventing sprocket shaking, deflection, and misalignment during polishing, thus ensuring the polishing accuracy and tooth surface uniformity of the single tooth.

[0070] After polishing a single set of tooth surfaces, the polishing mechanism is paused. The electric slide rail 17 drives the wire wheel 15 to retract from the polishing station and complete the retraction. Then, motor three 53 is started at speed one, driving the drive gear 19 to rotate slightly and precisely. Through gear meshing, the sprocket 20's tooth surface rotates intermittently, precisely switching the next tooth surface to be polished to the center of the polishing station. After the tooth surface switching is completed, motor three 53 is turned off, and the drive gear 19 is locked again. The above polishing process is repeated until all outer tooth surfaces of the sprocket 20 are polished. Then, motor two 52 is started, and the swing arm 51 drives the drive gear 19 to move and retract. Motor one 14 is started to move the wire wheel 15 and then the polished sprocket 20 is removed.

[0071] To achieve stable clamping and positioning of the sprocket 20, and to be compatible with the automatic polishing of the inner ring of the sprocket 20, thus solving the defect of traditional equipment that can only polish the outer teeth and cannot handle the burrs and rust on the inner ring, this device is equipped with an adaptive clamping and inner ring polishing switching mechanism on the top of the mounting base 16. The specific structure is as follows: a conical seat 4 is installed on the top surface of the mounting base 16, and a support frame 42 is fixedly connected to the top of the conical seat 4. Two horizontal grooves 54 and two vertical grooves 49 are evenly opened in a cross pattern on the support frame 42. Guide frames 48 are fixedly connected to the bottom of the horizontal grooves 54 and the vertical grooves 49.

[0072] A sliding plate 45 is vertically slidably connected inside the vertical groove 49. A storage spring 47 is provided between the sliding plate 45 and the corresponding side guide frame 48. The two sliding plates 45 are symmetrically arranged. A pressing block 46 is fixed to the outer wall of the sliding plate 45. When no external force is applied, the storage spring 47 rebounds and pushes the two sets of sliding plates 45 to move closer to each other, so that the two sets of pressing blocks 46 are in an inward state, which facilitates the insertion and assembly of the sprocket 20.

[0073] The inner cavity of the conical seat 4 is equipped with a motor 41. The output shaft of the motor 41 is keyed to a connecting shaft 43. The connecting shaft 43 vertically passes through the axis of the conical seat 4 and the support frame 42 and rotates in cooperation. The top end of the connecting shaft 43 is keyed to a rectangular columnar rotating column 44. Two sets of sliding plates 45 symmetrically abut against the short sides of the rotating column 44.

[0074] The polishing and clamping principle of the sprocket 20's external teeth: During the external tooth polishing stage, the starting motor 41 drives the connecting shaft 43 and the rotating column 44 to rotate in a specific direction. This causes the short side of the rotating column 44 to face and press against the sliding plates 45 on both sides, overcoming the elastic force of the storage spring 47 and pushing the two sets of sliding plates 45 to slide open in opposite directions. This causes the two pressing blocks 46 to expand outward synchronously. The two pressing blocks 46 press against the inner ring of the sprocket 20 in both directions, achieving rigid positioning and clamping of the sprocket 20. In this state, it engages and locks with the outer drive gear 19, forming a double positioning structure with inner support and outer lock, ensuring stable polishing of a single tooth. At the same time, the storage spring 47 has an elastic buffer margin. When tooth surface switching is required, it can cooperate with the drive gear 19 to rotate at low speed and adaptively yield slightly, ensuring smooth and unobstructed rotation of the sprocket 20.

[0075] A polishing brush head 55 is slidably connected to the bottom guide frame 48 of the transverse groove 54. A reset spring is provided between the polishing brush head 55 and the corresponding guide frame 48. The two polishing brush heads 55 are symmetrically abutted against the outer side of the long side of the rotating column 44, and can open and close as the posture of the rotating column 44 changes.

[0076] During the tooth-by-tooth polishing stage of the sprocket's outer teeth, the rotating column 44 maintains the posture of pressing the sliding plate 45 with its short side. At this time, the long side of the rotating column 44 corresponds to the two polishing brush heads 55, so that the two polishing brush heads 55 maintain an inwardly retracted position that is close to each other. The polishing brush heads 55 are completely separated from the inner ring of the sprocket 20, and the return spring remains in a relaxed state to avoid the brush heads interfering with the polishing of the outer teeth and the rotation of the tooth surface of the sprocket 20.

[0077] Automatic polishing switching process for the inner ring of sprocket 20: After all the outer tooth surfaces of sprocket 20 have been polished, there is no need to disassemble the workpiece. The rotating column 44 is rotated and reversed by motor 41, so that the long side of the rotating column 44 corresponds to the sliding plate 45 and the short side squeezes the polishing brush head 55. At this time, the sliding plate 45 loses its squeezing effect and moves closer together and retracts under the rebound action of the storage spring 47. The squeezing block 46 releases the tension limit on the inner ring of sprocket 20. At the same time, the short side of the rotating column 44 squeezes the two polishing brush heads 55, overcoming the spring force of the return spring and pushing the two polishing brush heads 55 to expand outward synchronously, so that the polishing brush heads 55 fit tightly against the inner ring of sprocket 20 and automatically enter the inner ring polishing station.

[0078] After the polishing brush head 55 is in position, the motor 3 53 is started to drive the drive gear 19 to rotate at high speed at speed 2. Through gear meshing, the sprocket 20 is driven to rotate at high speed. The inner ring of the high-speed rotating sprocket 20 generates relative friction with the fixed polishing brush head 55, which performs uniform polishing and grinding of burrs, oxide scale, and rust defects on the inner ring of the sprocket 20. The integrated polishing process of the outer teeth and inner ring of the sprocket 20 is completed in one go. After the processing is completed, all mechanisms automatically reset, and the finished sprocket 20 can be removed.

[0079] The front of the frame 1 is connected to two transparent doors 12. The two doors 12 close the front opening of the frame 1 and cooperate with the shell of the frame 1 to form a relatively sealed polishing working cavity. This can prevent dust and metal debris from splashing outward during the polishing process, improve the workshop working environment, and at the same time play a role in safety protection and transparent observation. It is convenient for staff to observe in real time and also avoids accidents caused by personnel accidentally touching the internal moving polishing mechanism during equipment operation. When it is necessary to load or unload materials, change polishing abrasives, or repair internal parts of the frame 1, the two sets of doors 12 can be opened outward to expose the working area inside the frame 1, which is convenient for operators to carry out workpiece loading and unloading, consumable replacement, and equipment maintenance.

[0080] In summary, the mechanical adaptive oscillating polishing mechanism of this device, through the motor 14, center wheel 3, transmission wheel 25, and gear ring 27 forming a reduction mechanism, works in conjunction with turntable 28, wave groove 29, and cam 33 to cause the wire wheel 15 to generate periodic small axial oscillations while rotating at high speed, uniformly polishing the tooth tips, tooth profiles, and tooth root dead corners. This effectively avoids the problems of insufficient polishing of tooth roots and excessive polishing of tooth tips with rounded corners in traditional fixed polishing wheels, and improves the polishing uniformity and forming accuracy of the sprocket 20 tooth surface.

[0081] The inner ring is elastically supported and positioned by the top pressing block 46, sliding plate 45, and storage spring 47 of the mounting base 16, and is engaged with the outer drive gear 19 for self-locking and limiting. During the polishing process, the sprocket 20 has no self-rotation, no offset, and no shaking.

[0082] The rotating column 44 is driven by motor 41 to switch postures, and can automatically switch between the "external tooth polishing inner support positioning state" and the "inner ring polishing brush head 55 contact state". When polishing the external teeth, the polishing brush head 55 automatically retracts to avoid the position, and when polishing the inner ring, the extrusion block 46 automatically retracts to relieve the force. No secondary clamping or workpiece transfer is required, and the polishing of the sprocket external teeth burrs, oxide scale and inner ring hole wall is completed in one go.

[0083] Motor 2 52 controls the overall positioning and meshing feed of drive gear 19, and motor 3 53 precisely controls the intermittent rotation of sprocket 20 teeth. With the help of electric slide rail 17, automatic entry and exit from the work station is achieved, realizing a full-process cycle operation of automatic tool setting, automatic polishing, automatic gear changing and automatic reset, which greatly improves processing efficiency and reduces manual labor intensity.

[0084] The automatic polishing method for motorcycle sprocket teeth is as follows:

[0085] Step 1: The equipment is powered on and in standby mode. Motor 2 52 drives the swing arm 51 to rise, keeping the drive gear 19 in an outward clearance position. The wire wheel 15 is in the clearance position, and the switch door 12 is opened to facilitate the assembly of workpieces and consumables.

[0086] Step 2: Place the sprocket 20 to be processed on the conical seat 4 of the mounting base 16 to complete the initial positioning;

[0087] Step 3: Start motor 41 to drive rotating column 44 to rotate, so that the short side of rotating column 44 presses against the sliding plates 45 on both sides, overcoming the elastic force of the storage spring 47 to make the sliding plates 45 expand outward, driving the pressing block 46 to press against the inner ring of sprocket 20, completing the center alignment of sprocket 20 and the rigid inner support fixation. At this time, the polishing brush head 55 is in the inward avoidance position and does not contact the inner ring of sprocket 20.

[0088] Step 4: Start motor 2 52 to drive swing arm 51 to swing down, drive drive gear 19 to move and mesh with the external teeth of sprocket 20, motor 3 53 locks to a standstill, using gear meshing self-locking to restrict the rotation of sprocket 20, forming a double fixed state of inner support and outer lock.

[0089] Step 5: Start the electric slide rail 17, which drives the motor 14, cross shaft 141, rotating shaft 142, moving plate 21 and wire wheel 15 to move forward as a whole through the slide block 13, so that the wire wheel 15 enters the polishing station of the sprocket 20 tooth surface.

[0090] Step 6: Start motor 14 to drive wire wheel 15 to rotate at high speed. At the same time, it drives center wheel 3 and turntable 2 31 to rotate at high speed. After two-stage reduction by transmission wheel 25 and gear ring 27, it drives turntable 1 28 to rotate at low speed. Through the linkage of wave groove 29 and cam 33, wire wheel 15 produces axial periodic small-amplitude oscillation, which polishes the tooth tip, tooth profile and tooth root of sprocket 20 at the current station in an all-round uniform polishing manner, removing burrs, oxide scale and micro protrusions.

[0091] Step 7: After polishing a single set of tooth surfaces, the electric slide rail 17 drives the wire wheel 15 to retract and move to a safe position. The motor 3 53 is started and rotates at a low speed. The sprocket 20 rotates intermittently to switch the next tooth surface to be polished to the polishing station. The motor 3 53 is stopped, and the drive gear 19 is locked again. The polishing process is repeated until all external teeth are polished.

[0092] Step 7: After all the outer teeth are polished, keep the sprocket 20 without disassembling it. Start the motor 41 to drive the rotating column 44 to change direction, so that the long side of the rotating column 44 corresponds to the sliding plate 45 and the short side squeezes the polishing brush head 55. The sliding plate 45 retracts and resets under the action of the storage spring 47, and the squeezing block 46 releases the inner ring limit. At the same time, the polishing brush head 55 expands outward to fit and press the inner ring of the sprocket 20.

[0093] Step 8: Start motor 3 53 to run at high speed 2, driving drive gear 19 and sprocket 20 to rotate at high speed. Through the relative friction between the inner ring of sprocket 20 and polishing brush head 55, the polishing operation of the inner ring of sprocket 20 is completed.

[0094] Step 9: After all polishing is completed, each mechanism is reset in sequence. The polishing brush head 55 and the extrusion block 46 are all in their positions, the drive gear 19 is moved out of its position, the wire wheel 15 is moved back to its original position, the switch door 12 is opened, the polished sprocket 20 is taken out, and the equipment returns to standby mode, waiting for the next processing.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An automatic polishing device for motorcycle sprocket teeth, comprising a frame (1), wherein a partition (18) is installed in the middle of the inner cavity of the frame (1), and the surface of the partition (18) is provided with a hollowed-out gap, characterized in that: The top surface of the partition (18) is equipped with a mounting base (16), and the mounting base (16) is provided with a sprocket (20) that rotates intermittently under control. The right side of the inner cavity of the frame (1) is provided with a drive gear (19) that rotates and moves under control. The drive gear (19) and the sprocket (20) mesh. The left side of the inner cavity of the frame (1) is provided with a mechanical swing polishing mechanism.

2. The automatic polishing device for motorcycle sprocket teeth according to claim 1, characterized in that: The mechanical oscillating polishing mechanism includes a movable plate (21) that slides laterally in the inner cavity of the frame (1), a rotating shaft (142) that slides through the middle of the movable plate (21), and a wire wheel (15) that is keyed to the front end of the rotating shaft (142).

3. The automatic polishing device for motorcycle sprocket teeth according to claim 2, characterized in that: An electric slide rail (17) is installed on the rear side of the inner cavity of the frame (1). A slide block (13) is slidably connected to the electric slide rail (17). A motor (14) is installed on the slide block (13). A cross shaft (141) is keyed to the output shaft of the motor (14). The cross shaft (141) and the rotating shaft (142) are slidably embedded at the rear end. A center wheel (3) and a turntable (31) are fixedly connected to the outer periphery of the rotating shaft (142). A number of circumferentially evenly distributed connecting columns (32) are detachably connected to the turntable (31). A cam (33) is rotated to the end of each connecting column (32). A number of positioning frames (24) are detachably connected to the moving plate (21). The positioning frames (24) correspond one-to-one with the connecting columns (32) and slide in cooperation. The movable plate (21) is detachably connected to three circumferentially evenly arranged tripods (22). A short shaft (23) is connected to the tripod (22), and a transmission wheel (25) is keyed to the short shaft (23). The three sets of transmission wheels (25) mesh with the central wheel (3) at the same time. A turntable (28) is connected between the three sets of tripods (22). A gear ring (27) is fixedly connected to the inner side of the turntable (28). The gear ring (27) meshes with the three transmission wheels (25) at the same time. The number of teeth of the transmission wheel (25) is greater than the number of teeth of the central wheel (3). The number of teeth of the gear ring (27) is greater than the number of teeth of the transmission wheel (25). The end face of the turntable (28) has an annular wave groove (29). The cam (33) is embedded and slidably connected to the wave groove (29).

4. The automatic polishing device for motorcycle sprocket teeth according to claim 3, characterized in that: Each of the tripods (22) has two sets of symmetrically arranged limiting balls (26) connected to its inner side, and the limiting balls (26) slide against the end face of the turntable (28).

5. The automatic polishing device for motorcycle sprocket teeth according to claim 3, characterized in that: A bracket (34) is fixed to the front side of the movable plate (21), and a protective sleeve (35) is installed on the bracket (34). The protective sleeve (35) is sleeved on the outer side of the front end of the rotating shaft (142) and slides in cooperation with the rotating shaft (142).

6. The automatic polishing device for motorcycle sprocket teeth according to claim 2, characterized in that: The frame (1) has a baffle one (2) and a baffle two (201) fixedly connected to the rear side of the inner cavity. The movable plate (21) is slidably connected between the baffle one (2) and the baffle two (201). The lateral length of the movable plate (21) is designed to be extended for redundancy.

7. The automatic polishing device for motorcycle sprocket teeth according to claim 6, characterized in that: A support (5) is installed on the front side of the baffle (201). A motor (52) is installed on the support (5). A swing arm (51) is keyed to the output shaft of the motor (52). A motor (53) is installed on the swing arm (51). A drive gear (19) is keyed to the output shaft of the motor (53). A conical seat (4) is installed on the top surface of the mounting base (16). A support frame (42) is fixed to the top of the conical seat (4). Two horizontal grooves (54) and two vertical grooves (49) are evenly opened in a cross pattern on the support frame (42). Guide frames (48) are fixed to the bottom of the horizontal grooves (54) and the vertical grooves (49). (49) A sliding plate (45) is vertically slidably connected inside. A storage spring (47) is provided between the sliding plate (45) and the corresponding side guide frame (48). The two sliding plates (45) are symmetrically arranged. A pressing block (46) is fixed to the outer wall of the sliding plate (45). A motor four (41) is installed in the inner cavity of the conical seat (4). The output shaft of the motor four (41) is keyed to a connecting shaft (43). The connecting shaft (43) vertically passes through the axis of the conical seat (4) and the support frame (42) and rotates. A rectangular column structure rotating column (44) is keyed to the top of the connecting shaft (43). Two sets of sliding plates (45) symmetrically abut against the short sides of the rotating column (44).

8. The automatic polishing device for motorcycle sprocket teeth according to claim 7, characterized in that: A polishing brush head (55) is slidably connected to the bottom guide frame (48) of the transverse groove (54). A reset spring is provided between the polishing brush head (55) and the corresponding guide frame (48). The two polishing brush heads (55) are symmetrically abutted against the outside of the long side of the rotating column (44).

9. The automatic polishing device for motorcycle sprocket teeth according to any one of claims 1-8, characterized in that: A fan (11) is fixedly installed at the top of the frame (1), and two switch doors (12) are connected to the front side of the frame (1).

10. An automatic polishing method for motorcycle sprocket teeth, using the automatic polishing device for motorcycle sprocket teeth as described in claim 8, comprising the following steps: Step 1: Power on the equipment and put it into standby mode. Motor 2 (52) drives the swing arm (51) to rise, so that the drive gear (19) is kept in the outer avoidance position, the wire wheel (15) is in the avoidance position, and the switch door (12) is opened to facilitate the assembly of workpieces and consumables. Step 2: Place the sprocket (20) to be processed on the conical seat (4) of the mounting base (16) to complete the initial positioning; Step 3: Start motor 4 (41) to drive the rotating column (44) to rotate, so that the short side of the rotating column (44) presses against the sliding plates (45) on both sides, overcoming the elastic force of the storage spring (47) to make the sliding plates (45) expand outward, driving the pressing block (46) to press against the inner ring of the sprocket (20), completing the center alignment of the sprocket (20) and the rigid inner support fixation. At this time, the polishing brush head (55) is in the inward avoidance position and does not contact the inner ring of the sprocket (20); Step 4: Start motor 2 (52) to drive swing arm (51) to swing down, drive drive gear (19) to move and mesh with the external teeth of sprocket (20), motor 3 (53) locks to a standstill, and uses gear meshing self-locking to restrict the rotation of sprocket (20), forming a double fixed state of inner support and outer lock. Step 5: Start the electric slide rail (17), and drive the motor (14), cross shaft (141), rotating shaft (142), moving plate (21) and wire wheel (15) forward as a whole through the slide block (13), so that the wire wheel (15) enters the polishing station of the sprocket (20) tooth surface; Step 6: Start motor 1 (14) to drive the wire wheel (15) to rotate at high speed, and at the same time drive the center wheel (3) and turntable 2 (31) to rotate at high speed. After the transmission wheel (25) and gear ring (27) reduce the speed, the turntable 1 (28) rotates at low speed. Through the linkage of the wave groove (29) and the cam (33), the wire wheel (15) generates a small axial periodic oscillation, which polishes the tooth tip, tooth profile and tooth root of the sprocket (20) at the current work position in an all-round uniform polishing manner, removing burrs, oxide scale and micro protrusions. Step 7: After polishing a single set of tooth surfaces, the electric slide rail (17) drives the wire wheel (15) to move backward to avoid a position, and the motor three (53) is started to rotate at a low speed of speed 1, driving the sprocket (20) to rotate intermittently, switching the next tooth surface to be polished to the polishing station, stopping the motor three (53), locking the drive gear (19) again, repeating the polishing process, and cycling until all external teeth are polished; Step 7: After all the outer teeth are polished, keep the sprocket (20) undisassembled and start the motor (41) to drive the rotating column (44) to change direction, so that the long side of the rotating column (44) corresponds to the sliding plate (45) and the short side squeezes the polishing brush head (55). The sliding plate (45) retracts and resets under the action of the storage spring (47), and the squeezing block (46) releases the inner ring limit. At the same time, the polishing brush head (55) expands outward to fit and press the inner ring of the sprocket (20). Step 8: Start motor 3 (53) to run at high speed of speed 2, drive drive gear (19) and sprocket (20) to rotate at high speed. Through the relative friction between the inner ring of sprocket (20) and polishing brush head (55), complete the polishing operation of the inner ring of sprocket (20). Step 9: After all polishing is completed, each mechanism is reset in sequence. The polishing brush head (55) and the extrusion block (46) are all moved out of position. The drive gear (19) is moved out of position. The wire wheel (15) is moved back to its reset position. The switch door (12) is opened. The polished sprocket (20) is taken out. The equipment returns to standby mode and waits for the next processing.

Images