A composite machining device for a motorcycle frame fitting

Abstract

The application relates to the field of accessory machining, and discloses a composite machining device for motorcycle frame accessories, which comprises a base and a rotating disc rotatingly arranged on the base, a plurality of machining stations are arranged on the rotating disc in the circumferential direction, a clamping piece for clamping a workpiece is arranged on each machining station, and the composite machining device further comprises a rotating shaft arranged on the base and provided with a shifting lever, and a rocker is arranged on each machining station and hinged to the rotating disc at one end. Through cooperation between the shifting lever on the rotating shaft and the stroke grooves on the rockers of the stations, full-automatic timing control of clamping, locking and loosening is realized, the three-section design of the stroke grooves provides an idle stroke and a position switching window, the lifting slope section realizes coarse positioning, and the eccentric inflection point section realizes self-locking, so that the establishment and release of the clamping force are determined by the rotating angle of the shifting lever, the manufacturing cost of the equipment and the complexity of the control system are reduced, and the timing reliability and stability of the equipment during high-speed operation are improved.

Description

Technical Field

[0001] This invention relates to the field of parts processing technology, specifically to a composite processing device for motorcycle frame parts. Background Technology

[0002] Motorcycle frame components are key parts of the braking system and frame structure, such as disc brake upper cylinders, frame connectors, and steering knuckles. These typically require machining of oil supply and return holes, handlebar holes, mounting holes, as well as oil cups, rearview mirror mounting holes, etc., resulting in numerous holes and high precision requirements. Currently, the industry mostly uses rotary multi-station machining equipment for this task. With each rotation of the rotary table, the workpiece passes through various stations in sequence, with drills, taps, and milling cutters rotating around to complete the machining of different parts in one go. The efficiency of this type of equipment generally depends on the coordination of the clamping, positioning, and repositioning steps.

[0003] In existing rotary multi-station equipment, each station is basically equipped with a separate pneumatic or hydraulic cylinder to drive the clamping parts, and each uses a solenoid valve to control when to clamp and release. Switching between stations also requires a separate indexing mechanism or indexing drive. The advantage of this approach is that each station can be controlled independently, which is more flexible, but the disadvantages are also obvious: First, each station needs to be equipped with a set of drive and control components, resulting in many parts, high cost, and troublesome maintenance; second, the clamping and releasing of each station relies entirely on electrical or pneumatic signals for coordination, making the system complex and prone to timing errors during high-speed operation, leading to malfunctions; third, in the event of sudden chatter or impact loads during processing, ordinary fixtures simply cannot react, lacking emergency protection mechanisms. These problems are particularly prominent in the current small-batch, multi-variety production mode, seriously slowing down production efficiency and limiting further improvement in processing quality. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a composite processing device for motorcycle frame parts, which solves the problems of current parts processing relying on electronic control for various processes, resulting in excessively high equipment requirements, and the lack of protective measures against sudden vibrations.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a composite processing device for motorcycle frame parts, comprising a base and a turntable rotatably mounted on the base. The turntable has a plurality of processing stations arranged along its circumference, and each processing station is provided with a clamping component for holding a workpiece. The device further comprises: a rotating shaft mounted on the base, the rotating shaft having a lever; and a rocker arm provided at each processing station, one end of the rocker arm being hinged to the turntable, the rocker arm having a travel groove for the lever to extend into and slide, and the other end of the rocker arm having a pushing block for pushing the clamping component toward the workpiece when the rocker arm swings. Directional movement; the stroke groove is divided into an arc segment, a lifting ramp segment, and a locking segment along the insertion direction of the lever; within the lifting ramp segment and the locking segment, when the lever rotates forward, it drives the rocker arm to swing and causes the clamping component to perform coarse positioning, pre-tightening, and locking of the workpiece in stages; when it rotates in the reverse direction, it drives the rocker arm to swing in the reverse direction and releases the stages of clamping the workpiece in stages; a gear and rack indexing mechanism is provided below the turntable, which drives the turntable to rotate by a preset angle only when the lever rotates in the reverse direction and moves to the arc segment; when the lever rotates forward through the arc segment, the gear and rack indexing mechanism does not drive the turntable to rotate.

[0006] Preferably, the locking section is an eccentric inflection point section. When the lever rotates in the forward direction and moves along the locking section, the rocker arm drives the push block to apply a locking force to the workpiece and achieve self-locking by passing the dead point.

[0007] Preferably, a force-limiting pawl mechanism is provided at the end of the locking section. The force-limiting pawl mechanism includes a pawl and a force-limiting spring. The pawl is engaged in the locking groove at the end of the locking section under the action of the force-limiting spring. When the cutting force or vibration impact on the workpiece exceeds a preset threshold, the impact force pushes the rocker arm to make the pawl overcome the elastic force of the force-limiting spring and disengage from the locking groove. The rocker arm then retracts to the lifting inclined section.

[0008] Preferably, a sinking guide mechanism is provided between the clamping member and the turntable, and the clamping member can float up and down relative to the turntable under the guidance of the sinking guide mechanism; the clamping member includes a first clamping plate and a second clamping plate arranged opposite to each other, and the sinking guide mechanism includes an inclined slide groove formed at the bottom of the first clamping plate and / or the second clamping plate and a guide roller provided on the turntable, the inclined slide groove extending inclinedly from bottom to top away from the workpiece; when the rocker arm retracts from the locking section to the lifting inclined section, the clamping force of the clamping member decreases from the locking force to the preload force, and the clamping member slides down along the inclined slide groove under its own weight, causing the workpiece to sink and disengage from the machining tool.

[0009] Preferably, the bottom of the inclined slide is provided with a limit screw to limit the downward stroke of the clamping member; a fixed support plate is provided on the machine base corresponding to each processing station, the fixed support plate is located directly below the workpiece, and is used to support the workpiece from the bottom when the workpiece sinks to limit its horizontal movement.

[0010] Preferably, the gear and rack indexing mechanism includes a small gear disposed at the bottom of the turntable and a rack pusher slidably disposed on the base. The rack pusher is provided with a rack that meshes with the small gear. The lever is provided with a lateral extension arm. When the lever rotates in the opposite direction and enters the arc segment, the lateral extension arm pushes the rack pusher to move linearly, and the rack drives the small gear to rotate the turntable.

[0011] Preferably, a one-way transmission mechanism is provided between the pinion and the turntable. The one-way transmission mechanism transmits rotation to the turntable only when the rack pusher pushes the pinion in the forward direction, and idles when the rack pusher pushes back in the reverse direction.

[0012] Preferably, a limit stop is provided at the end point of the rack push block's travel, and the limit stop is provided with an adjustable fine-tuning screw for precisely controlling the rotation angle of the turntable; a return spring is provided between the rack push block and the base for driving the rack push block back after the lever leaves the arc segment.

[0013] Preferably, each processing station on the turntable is provided with a V-shaped positioning recess at its bottom, and the machine base is provided with a spring positioning bead. When the gear and rack indexing mechanism drives the turntable to rotate to a preset angle, the spring positioning bead is engaged in the corresponding V-shaped positioning recess.

[0014] Preferably, a compression spring is provided between the rocker arm and the turntable, and the compression spring is used to drive the rocker arm to reset when the lever exits the travel groove.

[0015] This invention provides a composite processing device for motorcycle frame components. It has the following beneficial effects: 1. This invention achieves fully automatic timing control of clamping, locking, and releasing in a purely mechanical manner by setting a lever on the rotating shaft and a stroke groove on the rocker arm at each station. The three-section design of the stroke groove provides a shifting window in the arc section, achieves coarse positioning in the lift slope section, and achieves self-locking in the eccentric inflection point section. This makes the establishment and release of clamping force completely determined by the rotation angle of the lever, reducing the manufacturing cost of the equipment and the complexity of the control system, and improving the timing reliability and stability of the equipment when running at high speed.

[0016] 2. This invention provides the equipment with overload adaptive protection by setting a force-limiting ratchet mechanism at the end of the locking section. The ratchet and the locking groove cooperate with the wedge-shaped inclined surface to automatically decompose the impact force into two simultaneous components: a horizontal compression spring and a vertical lifting ratchet. When an overload occurs, the clamping force drops sharply from the locked state to the pre-tightened state, effectively avoiding tool breakage and workpiece scrap. It is especially suitable for scenarios where there are unpredictable fluctuations in cutting force during the machining process.

[0017] 3. The rack and pinion indexing mechanism achieves a purely mechanical linkage between clamping release and turntable repositioning. When the lever rotates in the reverse direction to the arc segment, the clamping parts are completely released, and the lateral extension arm pushes the rack pusher to drive the pinion to rotate, causing the turntable to rotate by a preset angle. By selecting the ratio of the pinion's pitch circle diameter to the rack stroke, the turntable rotation angle can be controlled. Combined with the secondary precise positioning by the end limit stop and the V-shaped recessed spring positioning ball, accurate positioning is achieved.

[0018] 4. In this invention, during the workpiece sinking process, the clamping plate continues to hold the workpiece with pre-tension, while the bottom fixed support plate supports it from below. The horizontal backward movement of the clamping plate is converted into a vertical sinking movement of the clamping plate and the workpiece using the cooperation of the inclined slide and guide rollers, ensuring that the workpiece sinks only vertically and does not shift horizontally. This design achieves rapid disengagement of the tool from the workpiece and ensures the positional stability of the workpiece in the protected state. After resetting, processing can continue without realigning, shortening the recovery time after abnormal shutdowns and effectively preventing secondary damage to the workpiece during the protected process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the overall structure of the present invention; Figure 3 This is a schematic diagram of the overall front view of the present invention; Figure 4 This is a schematic diagram of the workpiece processing area structure of the present invention; Figure 5 This is a schematic diagram of the stroke groove and rocker arm structure of the present invention; Figure 6 This is a schematic diagram of the gear and rack indexing mechanism of the present invention; Figure 7 This is a schematic diagram of the exploded structure of the gear and rack indexing mechanism of the present invention; Figure 8 This is a schematic diagram of the force-limiting ratchet mechanism of the present invention; Figure 9 This is a partial cross-sectional structural diagram of the force-limiting ratchet mechanism of the present invention.

[0020] The components are as follows: 1. Base; 2. Turntable; 3. Clamping component; 31. First clamping plate; 32. Second clamping plate; 4. Rotating shaft; 5. Lever; 6. Rocker arm; 7. Stroke groove; 71. Arc segment; 72. Lifting inclined segment; 73. Locking segment; 8. Push block; 9. Gear and rack indexing mechanism; 91. Pinion; 92. Rack push block; 93. Lateral extension arm; 94. Fixed plate; 95. One-way plate; 10. Force-limiting pawl mechanism; 101. Pawl; 102. Force-limiting spring; 103. Locking groove; 13. Cutting mechanism; 14. Gear motor; 15. Waist-shaped hole; 16. Slider; 17. Roller; 18. Turntable. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: Please refer to the appendix Figure 1 - Appendix Figure 4 The present invention provides a composite processing device for motorcycle frame parts, including a base 1, a turntable 18 disposed on the base 1 and a turntable 2 rotatably connected to the turntable 18. A plurality of processing stations are evenly arranged along the circumference of the turntable 18. Each processing station is provided with a clamping member 3 for clamping the workpiece. A rotating shaft 4 driven by a reduction motor 14 is rotatably connected to the base 1. A lever 5 is fixedly connected to the rotating shaft 4 and rotates synchronously with the rotating shaft 4.

[0023] Each processing station is equipped with a rocker arm 6. One end of the rocker arm 6 is hinged to the turntable 2 via a hinge shaft. The rocker arm 6 can swing around the hinge shaft in the horizontal plane. The hinge shaft is located at the outer edge of the turntable 2 in the radial direction to avoid the rotating shaft 4 and gear mounting area at the center below the turntable 2. The rocker arm 6 is provided with a stroke groove 7, which opens towards the center of the turntable 2.

[0024] The lever 5 has an oblong hole 15 extending axially along its end. A slider 16 is slidably fitted inside the oblong hole 15, and a roller 17 is rotatably connected to the slider 16. The roller 17 extends into the travel groove 7 and rolls against the side wall of the travel groove 7. An elastic element is connected between the slider 16 and the oblong hole 15 to keep the roller 17 pressed against the working surface of the travel groove 7 to eliminate clearance and compensate for assembly errors. A push block 8 is fixedly connected to the other end of the rocker arm 6. The push block 8 is used to push the clamping member 3 toward the workpiece when the rocker arm 6 swings, or to retract as the rocker arm 6 swings in the opposite direction.

[0025] like Figure 3As shown, the travel groove 7 is divided into three functional sections along the movement direction of the roller 17: an arc section 71, a lift ramp section 72, and a locking section 73. The trajectory of the arc section 71 is an arc centered on the hinge axis. When the roller 17 rolls within this section, since the trajectory of the arc section 71 is concentric with the movement trajectory of the roller 17, the groove wall does not generate radial thrust, the rocker arm 6 does not swing, and the clamping member 3 remains stationary. The trajectory of the lift ramp section 72 is offset outward relative to the arc section 71. When the roller 17 moves along this section, the offset trajectory of the travel groove 7 applies a normal thrust to the roller 17 through the groove wall, pushing the rocker arm 6 to swing around the hinge axis. The locking section 73 is an eccentric inflection point section; its trajectory deviates from the radial direction of the hinge center of the rocker arm 6, forming an eccentric arc. After the roller 17 enters this section, the swing amplitude of the rocker arm 6 reaches its maximum.

[0026] The clamping component 3 includes a first clamping plate 31 and a second clamping plate 32 arranged opposite to each other. The first clamping plate 31 is slidably fitted onto a linear guide rail on the turntable 2, allowing the first clamping plate 31 and the second clamping plate 32 to move closer or further apart relative to each other along the radial direction of the turntable 2. An L-shaped block is fixedly connected to the back of the first clamping plate, and one side of the L-shaped block has an arc-shaped chamfer. A push block 8 is also fixedly connected to the rocker arm 6. When swinging, the push block 8 directly pushes the first clamping plate 31 to move towards the workpiece. The second clamping plate 32 is fixedly connected to the turntable 2 as a positioning reference surface. Both the clamping surfaces of the first clamping plate 31 and the second clamping plate 32 are provided with anti-slip textures.

[0027] The working process of this embodiment is as follows: The lever 5 rotates forward with the shaft 4, and the roller 17 moves along its trajectory within the stroke groove 7. First, it enters the arc section 71, where the roller 17 rolls through it. The groove wall does not generate radial thrust, the rocker arm 6 does not swing, and the clamping member 3 remains open, awaiting the workpiece placement. Then, the roller 17 enters the lift ramp section 72, rolling along it. The groove wall applies a normal thrust to the roller 17, pushing the rocker arm 6 to swing around the hinge axis. The rocker arm 6, through the push block 8, pushes the first clamping plate towards the workpiece, lightly touching the workpiece surface with a pre-tightening force to achieve coarse positioning. At this point, the workpiece is basically fixed within the clamping space but not yet locked. The roller 17 then continues to rotate into the locking section 73, rolling along an eccentric arc. The eccentricity of the stroke groove 7 further increases, the swing amplitude of the rocker arm 6 reaches its maximum, and the push block 8's thrust on the first clamping plate increases exponentially. The first clamping plate presses the workpiece firmly onto the second clamping plate. At the same time, the rocker arm 6 passes the mechanical dead point and enters a self-locking state. Even if the lever 5 continues to rotate away from this position, the rocker arm 6 remains locked. Then, the processing device above performs the corresponding processing operation on the workpiece.

[0028] After processing, lever 5 rotates in the opposite direction with shaft 4. Roller 17 first exits locking section 73, and rocker arm 6 exits dead point under the push of roller 17, releasing the locking force. Subsequently, roller 17 exits lifting ramp section 72, and rocker arm 6 swings back to reset under the push of roller 17. Push block 8 retracts, and the clamping force of the first clamping plate decreases from locking force to preload, and clamping member 3 releases its grip on the workpiece. When roller 17 continues to roll in the opposite direction and fully retracts to arc section 71, clamping member 3 is fully open, rocker arm 6 is in idle state, and roller 17 is located at the opening of stroke groove 7.

[0029] At this moment, the gear and rack indexing mechanism 9 begins to operate, driving the turntable 2 to rotate at a preset angle. The rocker arm 6 of the current station rotates with the turntable 2 and moves away from the range of action of the lever 5; simultaneously, the rocker arm 6 of the next processing station rotates with the turntable 2 to the front of the lever 5, and the stroke groove 7 of the rocker arm 6 is exactly opposite to the roller 17 at the end of the lever 5. After the turntable 2 rotates to its position, the lever 5 rotates forward again, and the roller 17 enters the stroke groove 7 of the rocker arm 6 of the next station, starting to push the rocker arm 6 and repeating the next round of clamping action.

[0030] This process is repeated continuously to achieve sequential processing of workpieces at each workstation. Example

[0031] Please see the appendix Figure 5 - Appendix Figure 7 Based on Embodiment 1, this embodiment further provides the specific structure of the gear and rack indexing mechanism 9 and a precise control scheme for the rotation angle of the turntable 2.

[0032] like Figure 6 As shown, the gear and rack indexing mechanism 9 includes a pinion 91 and a rack pusher 92. The pinion 91 is fixedly connected to the bottom center of the turntable 2 and is coaxially fixed with the turntable 2. The rack pusher 92 is slidably fitted on the linear guide rail of the base 1, located to the side of the pinion 91. The plane of motion of the rack pusher 92 is lower than the swing plane of the rocker arm 6, and is vertically offset from the rocker arm 6, so that the two do not interfere with each other during movement. A rack is machined on the side of the rack pusher 92 facing the pinion 91, and the rack meshes with the pinion 91. A return spring is also connected between the rack pusher 92 and the base 1 to drive the rack pusher 92 back to its initial position.

[0033] A lateral extension arm 93 is fixedly connected to the lever 5. The lateral extension arm 93 rotates with the lever 5, and its movement trajectory lies within the movement plane of the rack push block 92. A fixed plate 94 is fixedly connected to the rack push block 92, and a one-way plate 95 is rotatably connected to the fixed plate 94. When the rocker arm 6 rotates in the forward direction, the one-way plate 95 rotates, while when the rocker arm 6 rotates in the reverse direction, the one-way plate 95 does not rotate, thus pushing the rack push block 92 to move. This causes the pinion 91 to rotate with the rotating shaft 4, and the rotating shaft 4 to rotate with the turntable 2, ultimately achieving the purpose of automatically switching the processing position.

[0034] By selecting the ratio of the pitch circle diameter of the pinion 91 to the stroke of the rack pusher 92, the rotation angle of the turntable 2 can be precisely controlled. If the turntable 2 needs to rotate 90° each time, the required rack stroke L can be calculated according to the formula θ=L / R, where θ is the rotation radius of the turntable 2, L is the rack stroke, and R is the pitch circle radius of the pinion 91. A limit stop is fixedly connected at the end point of the rack pusher 92's travel to control the precise value of L.

[0035] When lever 5 rotates forward again and leaves arc segment 71, lateral extension arm 93 rotates away from rack push block 92, and rack push block 92 returns to its initial position under the action of return spring. Since there is a one-way bearing connecting pinion 91 and turntable 2, when rack push block 92 retracts, rack drives pinion 91 to rotate in the opposite direction, which will not cause turntable 2 to reverse.

[0036] like Figure 7 As shown, to eliminate the angular deviation caused by the gear and rack meshing clearance, V-shaped positioning recesses are machined at the bottom of each machining station on the turntable 2, and spring positioning balls are fixedly connected to the machine base 1. The spring positioning ball consists of a steel ball, a compression spring, and a housing. The steel ball extends partially from the opening of the housing under the action of the compression spring. When the turntable 2 rotates to a certain station, the steel ball of the spring positioning ball is engaged in the corresponding V-shaped positioning recess under the action of the compression spring. The sloping structure of the V-shaped recess generates a centripetal force on the steel ball, drawing the turntable 2 into the precise position and eliminating the angular deviation caused by the gear and rack meshing clearance. When the turntable 2 needs to continue rotating and changing positions, the driving torque provided by the gear and rack indexing mechanism 9 is sufficient to overcome the elastic force of the compression spring, pushing the steel ball out of the V-shaped recess.

[0037] The working sequence of this embodiment is as follows: When lever 5 rotates forward through arc segment 71: during idle stroke, clamping member 3 remains open, allowing the workpiece to be placed or removed; when lever 5 rotates forward through inclined section 72: clamping member 3 closes with pre-tightening force, achieving coarse positioning. When lever 5 rotates forward, it is locked by clamping section 73 and clamping part 3. When rocker 6 passes the dead point, it self-locks and begins processing. Rotate lever 5 in the reverse direction to disengage locking section 73: release the lock; When lever 5 is rotated in the reverse direction to exit the inclined section 72 of the lift stroke, the clamping force is reduced to the preload force. The lever 5 rotates in the opposite direction and returns to the arc segment 71: the lateral extension arm 93 pushes the rack pusher 92, driving the turntable 2 to rotate at a preset angle, completing the repositioning.

[0038] This completes a full cycle of clamping, processing, releasing, and repositioning. Then, lever 5 rotates clockwise again to begin the next cycle. Example

[0039] Please see the appendix Figure 8 -Appendix Figure 9 Based on Embodiment 1 or Embodiment 2, this embodiment adds a force-limiting ratchet mechanism 10, enabling the equipment to have overload detection and automatic release functions.

[0040] like Figure 5 As shown, a force-limiting pawl mechanism 10 is fixedly connected to the end of the locking section 73 of the travel groove 7. This mechanism includes a pawl 101, a force-limiting spring 102, and a pawl 101 seat. The pawl 101 seat is fixedly connected to the rocker arm 6 near the end of the travel groove 7. The pawl 101 is hinged to the pawl 101 seat via a pin, allowing it to swing around the pin. The pawl 101 is wedge-shaped, with its middle section hinged to the pawl 101 seat via a pin. One end has a wedge-shaped head, and the other end is a spring abutment surface. The force-limiting spring 102 is a compression spring installed between the pawl 101 seat and the tail of the pawl 101. One end abuts against the side wall of the pawl 101 seat, and the other end abuts against the tail of the pawl 101. Under the action of the force-limiting spring 102, the head of the pawl 101 is pressed towards the locking groove 103 at the end of the locking section 73 and engages within the locking groove 103. The locking groove 103 is a recess machined into the bottom of the stroke groove 7, and its shape is adapted to the wedge-shaped head of the pawl 101. The groove wall of the locking groove 103 near the lift ramp section 72 is a ramp, which fits against the wedge-shaped ramp of the head of the pawl 101.

[0041] When roller 17 moves to the end along locking section 73, lever 5 pushes rocker arm 6 into the locking position. At this time, the head of pawl 101 automatically engages in locking groove 103 under the action of force limiting spring 102, locking rocker arm 6 in the locking position. Even if lever 5 retracts slightly, pawl 101 can keep rocker arm 6 in the locked state, ensuring stable clamping force during processing.

[0042] When a sudden chatter or abnormal impact load occurs during processing, the impact force is transmitted along the workpiece, the first clamping plate, the push block 8, and the rocker arm 6 to the wall of the locking groove 103. The inclined surface of the locking groove 103 wall applies normal pressure to the wedge-shaped inclined surface of the pawl 101 head. This normal pressure simultaneously generates two component forces: the horizontal component pushes the pawl 101 backward and compresses the force-limiting spring 102, while the vertical component lifts the head of the pawl 101 upward, causing it to disengage from the locking groove 103. When the horizontal component force generated by the impact exceeds the preload of the force-limiting spring 102, the two component forces act simultaneously—the pawl 101 is lifted while it is backward, and its head completely disengages from the locking groove 103. After the rocker arm 6 loses the lock of the pawl 101, it quickly retracts from the locking section 73 to the lifting inclined surface section 72 under the action of the impact force. The clamping force drops sharply from the locking force to the preload force, and the workpiece loses its rigid locking constraint but maintains preload contact.

[0043] This overload tripping process is triggered and driven entirely by mechanical force, effectively preventing tool breakage and workpiece scrap. After the abnormal impact disappears, the operator restarts the equipment, causing the lever 5 to rotate forward again. The roller 17 passes through the arc section 71 and the lifting inclined section 72 in sequence before entering the locking section 73, pushing the rocker arm 6 to press the pawl 101 back into the locking groove 103, and the equipment resumes normal processing. Example

[0044] This embodiment, based on embodiment three, further adds a sinking guide mechanism. When the force-limiting pawl 101 mechanism 10 is triggered to release, the sinking guide mechanism guides the workpiece to actively sink and disengage from the machining tool.

[0045] like Figure 4 As shown, the clamping member 3 includes a first clamping plate 31 and a second clamping plate 32 arranged opposite to each other. The first clamping plate 31 and the second clamping plate 32 are slidably engaged on the linear guide rails on the turntable 2, and can be horizontally closer to or further away from each other along the radial direction of the turntable 2. A pushing block 8 is fixedly connected to the back of the first clamping plate. An inclined groove is provided at the bottom of the first clamping plate, and the inclined groove extends inclinedly from bottom to top in a direction away from the workpiece. A guide roller is rotatably connected to the turntable 2, and the guide roller extends into the inclined groove and rolls with it.

[0046] When the pusher block 8 pushes the first clamping plate horizontally toward the workpiece, the inclined slide follows the horizontal movement of the first clamping plate. The guide roller slides from a higher position to a lower position relative to the slide. Due to the inclination of the slide, the first clamping plate 31 is lifted upward by the guide roller as it approaches the workpiece horizontally, causing the workpiece to rise to the machining position. Conversely, when the pusher block 8 retracts, the first clamping plate retracts horizontally outward, and the guide roller slides from a lower position back to a higher position relative to the slide. Under its own weight, the first clamping plate slides down the inclined slide, causing the workpiece to sink and disengage from the machining tool. A limit screw is threaded at the bottom of the inclined slide, and the downward stroke of the first clamping plate can be precisely controlled by adjusting the extension length of the limit screw.

[0047] When the force-limiting ratchet 101 mechanism 10 in Embodiment 3 triggers its release and the rocker arm 6 retracts from the locking section 73 to the lifting inclined section 72, the push block 8 retracts with the rocker arm 6, the first clamping plate retracts horizontally outward, and the guide roller slides back from a lower position to a higher position relative to the slide groove. Under its own weight, the first clamping plate slides down along the inclined slide groove, causing the workpiece to sink within a range of 0.5-3.0 mm. A fixed support plate is fixedly connected to the machine base 1 at the position corresponding to each processing station, and the fixed support plate is located directly below the workpiece. When the workpiece sinks, the fixed support plate supports the workpiece from the bottom, and together with the first clamping plate which still clamps the workpiece with pre-tightening force, they jointly restrict the horizontal movement of the workpiece, ensuring that the workpiece sinks only in the vertical direction and completely disengages from the processing tool above.

[0048] Once the abnormal impact subsides, the operator restarts the equipment, causing lever 5 to rotate forward again. Roller 17 passes sequentially through arc section 71 and inclined section 72 before entering locking section 73, pushing rocker arm 6 to re-press pawl 101 into locking groove 103. Simultaneously, push block 8 moves forward with rocker arm 6, pushing first clamping plate / 31 horizontally towards the workpiece. As the first clamping plate approaches the workpiece horizontally, it is lifted upward by guide rollers, raising the workpiece back to the processing position and locking it, allowing the equipment to resume normal processing.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite processing device for motorcycle frame parts, comprising a base (1) and a turntable (2) rotatably disposed on the base (1), wherein the turntable (2) is provided with a plurality of processing stations along the circumferential direction, and each processing station is provided with a clamping member (3) for clamping a workpiece, characterized in that, Also includes: A rotating shaft (4) is provided on the base (1), and a lever (5) is provided on the rotating shaft (4). Each of the processing stations is provided with a rocker arm (6), one end of which is hinged to the turntable (2). The rocker arm (6) is provided with a stroke groove (7) for the lever (5) to extend into and slide. The other end of the rocker arm (6) is provided with a push block (8). The push block (8) is used to push the clamping member (3) to move towards the workpiece when the rocker arm (6) swings. The stroke groove (7) is divided into an arc section (71), a lifting slope section (72), and a locking section (73) in sequence along the insertion direction of the lever (5). In the lifting slope section (72) and the locking section (73), when the lever (5) rotates in the forward direction, it drives the rocker arm (6) to swing and drive the clamping member (3) to perform coarse positioning pre-tightening and locking fixation of the workpiece in stages. When it rotates in the reverse direction, it drives the rocker arm (6) to swing in the reverse direction and release the stage clamping of the workpiece in stages. The turntable (2) is provided with a gear and rack indexing mechanism (9). The gear and rack indexing mechanism (9) drives the turntable (2) to rotate by a preset angle only when the lever (5) rotates in the reverse direction and moves to the arc segment (71). When the lever (5) rotates in the forward direction through the arc segment (71), the gear and rack indexing mechanism (9) does not drive the turntable (2) to rotate.

2. The composite processing device for motorcycle frame parts according to claim 1, characterized in that, The locking section (73) is an eccentric inflection point section. When the lever (5) rotates in the forward direction and moves along the locking section (73), the rocker arm (6) drives the push block (8) to make the clamping member (3) apply a locking force to the workpiece and pass the dead point to achieve self-locking.

3. The composite processing device for motorcycle frame parts according to claim 1, characterized in that, The locking section (73) is provided with a force-limiting pawl mechanism (10) at its end. The force-limiting pawl mechanism (10) includes a pawl (101) and a force-limiting spring (102). The pawl (101) is engaged in the locking groove (103) at the end of the locking section (73) under the action of the force-limiting spring (102). When the cutting force or vibration impact on the workpiece exceeds the preset threshold, the impact force pushes the rocker arm (6) to make the pawl (101) overcome the elastic force of the force-limiting spring (102) and disengage from the locking groove (103). The rocker arm (6) then retracts to the lifting inclined section (72).

4. The composite processing device for motorcycle frame parts according to claim 3, characterized in that, A sinking guide mechanism is provided between the clamping member (3) and the turntable (2). The clamping member (3) can float up and down relative to the turntable (2) under the guidance of the sinking guide mechanism. The clamping member (3) includes a first clamping plate (31) and a second clamping plate (32) arranged opposite to each other. The sinking guide mechanism includes an inclined groove opened at the bottom of the first clamping plate or the second clamping plate and a guide roller arranged on the turntable (2). The inclined groove extends inclinedly from bottom to top away from the workpiece. When the rocker arm (6) retracts from the locking section (73) to the lifting inclined section (72), the clamping force of the clamping member (3) decreases from the locking force to the preload force. The clamping member (3) slides down along the inclined groove under its own weight, causing the workpiece to sink and get off the machining tool.

5. The composite processing apparatus for motorcycle frame parts according to claim 4, characterized in that, The bottom of the inclined slide is provided with a limit screw to limit the downward stroke of the clamping member (3); the base (1) is provided with a fixed support plate corresponding to each processing station. The fixed support plate is located directly below the workpiece and is used to support the workpiece from the bottom to limit its horizontal movement when the workpiece sinks.

6. The composite processing apparatus for motorcycle frame parts according to claim 1, characterized in that, The gear and rack indexing mechanism (9) includes a small gear (91) disposed at the bottom of the turntable (2) and a rack pusher (92) slidably disposed on the base (1). The rack pusher (92) is provided with a rack that meshes with the small gear (91). The lever (5) is provided with a lateral extension arm (93). When the lever (5) rotates in the opposite direction and enters the arc segment (71), the lateral extension arm (93) pushes the rack pusher (92) to move linearly. The rack drives the small gear (91) to drive the turntable (2) to rotate.

7. The composite processing apparatus for motorcycle frame parts according to claim 6, characterized in that, A one-way transmission mechanism is provided between the pinion (91) and the turntable (2). The one-way transmission mechanism transmits rotation to the turntable (2) only when the rack pusher (92) pushes the pinion (91) in the forward direction, and idles when the rack pusher (92) retracts in the reverse direction.

8. The composite processing apparatus for motorcycle frame parts according to claim 6, characterized in that, The rack pusher (92) is provided with a limit stop at its travel end point. The limit stop is provided with an adjustable fine-tuning screw for precisely controlling the rotation angle of the turntable (2). A reset spring is provided between the rack pusher (92) and the base (1) for driving the rack pusher (92) back after the lever (5) leaves the arc segment (71).

9. The composite processing device for motorcycle frame parts according to claim 1, characterized in that, Each processing station on the turntable (2) has a V-shaped positioning recess at its bottom, and the machine base (1) has a spring positioning bead. When the gear rack indexing mechanism (9) drives the turntable (2) to rotate to a preset angle, the spring positioning bead is engaged in the corresponding V-shaped positioning recess.

10. The composite processing apparatus for motorcycle frame parts according to claim 1, characterized in that, A compression spring is provided between the rocker arm (6) and the turntable (2), and the compression spring is used to drive the rocker arm (6) to reset when the lever (5) exits the travel groove (7).

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