Rotary transfer indexing apparatus and method of machining using the same

Abstract

The present application relates to a kind of rotary transmission indexing device, including rack assembly, indexing turntable assembly, double-station machining execution unit, indexing locking mechanism and intermittent indexing drive mechanism, indexing turntable assembly includes indexing turntable, double-station machining execution unit includes main drive assembly, two groups of machining execution mechanism and two groups of machining precision compensation mechanism.Indexing locking mechanism is transmission connection with the input end of the main drive assembly, intermittent indexing drive mechanism is transmission connection with the output end of the main drive assembly, for driving the indexing turntable around the indexing axis does accurate step type circumferential rotation, solve the core technical problems of the existing multi-station indexing device, such as low synchronization accuracy of multiple power sources, poor double-sided machining efficiency, no online precision compensation, complex structure and large volume.

Description

Technical Field

[0001] This invention relates to the field of automated precision machining equipment technology, and in particular to a rotary conveying indexing device and machining method that integrates single-power drive, synchronous machining at both upper and lower workstations, and online precision compensation functions. Background Technology

[0002] Multi-station rotary conveyor indexing device is a core functional component of automated production line. It is used to realize the intermittent conveying and precise positioning of workpieces between different processing stations. Its indexing accuracy, synchronization and integration directly determine the production efficiency and product quality of the production line.

[0003] Patent document No. 201780064603.X discloses a rotary indexing conveyor, comprising: a frame; a rotary table supported on the frame for rotating about an indexing axis; at least one workpiece carrying spindle, including a hollow shaft for receiving a workpiece therein and a clamping device for clamping a workpiece inserted into the hollow shaft, the clamping device including a chuck coupled to the workpiece carrying spindle, the workpiece carrying spindle being mounted on the rotary table, and the hollow shaft and chuck of at least one workpiece carrying spindle being connected to rotate together about the spindle rotation axis, the indexing machine further comprising: at least one support member disposed in a fixed position next to the rotary table; at least one processing station having at least one processing unit supported on the support member to allow processing of the workpiece clamped in the chuck; at least one drive motor for rotating the hollow shaft and chuck about the spindle rotation axis, the at least one drive motor being mounted on the rotary table.

[0004] However, in actual use, completing a full processing task requires multiple power sources and independent transmission systems, resulting in complex equipment structure, a large number of parts, and high maintenance difficulty, making it difficult to adapt to the needs of compact automated production lines. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a rotary conveying indexing device that solves the problems of low synchronization accuracy of multiple power sources, poor double-sided processing efficiency, and complex structure and large size of existing multi-station indexing devices. It achieves a highly integrated design that enables single power source to drive multiple mechanical movements with hard synchronization, synchronous processing of upper and lower double stations, and automatic compensation for processing accuracy.

[0006] To address the above technical issues, the following technical solution is adopted: A rotary conveying indexing device includes: a frame assembly; Indexing turntable assembly, the indexing turntable assembly including an indexing turntable, the indexing turntable being rotatably supported on the frame assembly by cross roller bearings to perform intermittent rotational motion around the indexing axis; The dual-station machining execution unit includes a main drive assembly located below the indexing turntable assembly, two sets of machining execution mechanisms vertically and vertically mounted on the frame assembly and correspondingly located on the upper and lower sides of the indexing turntable, and two sets of machining accuracy compensation mechanisms respectively corresponding to the two sets of machining execution mechanisms. The machining accuracy compensation mechanism completes the position switching action of the machining execution mechanism under the drive of the main drive assembly, and the two sets of machining execution mechanisms move up and down synchronously under the drive of the main drive assembly. The indexing locking mechanism is connected to the main drive assembly and can be intermittently inserted into the indexing turntable to perform precise circumferential positioning and locking of the indexing turntable. And an intermittent indexing drive mechanism, which is connected to the main drive assembly for driving the indexing turntable to make precise stepping circular rotations around the indexing axis.

[0007] Preferably, the main drive assembly includes: a servo drive motor, which is eccentrically disposed within the hollow cavity of the indexing turntable; and a planetary gear reducer, the input end of which is connected to the output shaft of the servo drive motor.

[0008] Preferably, the rack assembly includes a main mounting plate, a hollow tubular support shaft, and a guide plate arranged coaxially from bottom to top; The main drive assembly is mounted on the main mounting plate, and the indexing turntable is rotatably fitted around the outer periphery of the guide plate; The indexing turntable has multiple sets of locating pin holes and multiple sets of workpiece mounting holes arranged from the inside out, with its center as the center. The locating pin holes and the workpiece mounting holes are evenly distributed at equal angles along the circumference of the indexing turntable.

[0009] Preferably, the indexing locking mechanism includes a transmission push rod, a compression spring assembly, and a locking pin arranged coaxially from bottom to top; The upper end of the compression spring assembly is mounted on the frame assembly, and the lower end is connected to the transmission push rod, which is used to apply a continuous upward elastic preload to the locking pin; The upper end of the locking pin is inserted into the positioning pin hole with an H7 / g6 clearance fit; the upper end of the locking pin is provided with a travel limit block, and the upper end face of the travel limit block is intermittently in contact with the lower end face of the guide plate to limit the maximum upward travel of the locking pin.

[0010] Preferably, the indexing locking mechanism is driven by a cam synchronous transmission assembly, which includes: The synchronous drive unit includes a first transmission gear that is synchronously driven with the output shaft of the servo drive motor, a second transmission gear that meshes externally with the first transmission gear and rotates coaxially with the planetary gear reducer, and a locking cam disk that is coaxially fixedly connected to the second transmission gear and rotates synchronously. And a lever transmission unit, the lever transmission unit including an L-shaped swing arm lever rotatably mounted on the main mounting plate, the lower end of the swing arm lever intermittently abutting the contour surface of the locking cam plate, and its upper end hinged to the lower end of the transmission push rod.

[0011] Preferably, both the indexing locking mechanism and the lever transmission unit are provided in two sets; the two sets of indexing locking mechanisms are arranged symmetrically about the center of the indexing turntable; the lower ends of the swing arm levers of the two sets of lever transmission units are connected by a synchronous connecting rod.

[0012] Preferably, the intermittent indexing drive mechanism includes: A pawl mounting base is mounted on the guide plate; Indexing lever, the indexing lever passes through the pawl mounting base and is rotatably mounted on the pawl mounting base, the lower end of the indexing lever is synchronously driven with the output shaft of the planetary gear reducer through a torque limiting coupling; indexing pawl, the indexing pawl is eccentrically set at the upper end of the indexing lever; The indexing turntable has multiple indexing grooves, which are evenly spaced along the circumference at equal angles on the inner sidewall. The indexing pawl can rotate with the indexing lever and enter the indexing grooves to drive the indexing turntable to rotate precisely by one work position angle.

[0013] Preferably, the processing actuator includes: The guide assembly includes a main drive shaft that rotates coaxially with the servo drive motor, and a cylindrical camshaft that is coaxially connected to the main drive shaft. A continuous closed arc-shaped guide rail is machined on the outer circumferential surface of the cylindrical camshaft. The lifting slide assembly includes a slide body mounted on the upper end of the frame assembly, a lifting guide rod elastically disposed on the slide body and vertically penetrating the indexing turntable, and a driven member fixedly connected to the lifting guide rod and engaging with the arc-shaped guide rail to realize the lifting action. The machining head switching assembly has two sets symmetrically arranged at both ends of the lifting guide rod. The machining head switching assembly includes a switching turntable rotatably mounted on the lifting guide rod via a steel sleeve, several sets of drive paddles evenly distributed on the switching turntable, a machining head mounting seat rotatably mounted at the end of the lifting guide rod via a bearing, and two sets of connecting columns vertically arranged at both ends of the machining head mounting seat and connected to the lower end of the switching turntable. Adjacent drive paddles are installed facing opposite directions.

[0014] Preferably, the machining accuracy compensation mechanism includes: The compensation mechanism mounting plate is a hollow structure and is coaxially fixedly mounted on the guide plate. A compensating swing arm is rotatably mounted on the compensation mechanism mounting plate via a return spring. An eccentric compensating cam adjustment component with an eccentricity structure is rotatably mounted on the compensating swing arm, and the eccentricity adjustment range is 0-2mm. A position locking block is mounted on the compensation mechanism mounting plate via a locking bolt and is used to lock the compensating swing arm to fix the initial phase position of the compensating cam adjustment component. The compensation cam disk is coaxially connected to the main drive shaft and makes guide contact with the outer circumferential surface of the compensation cam adjustment component to drive the compensation swing arm to perform reciprocating swing motion. And a compensation drive shaft, which is horizontally fixedly installed at the other end of the compensation swing arm, with its end extending into the radial drive hole of the switching turntable.

[0015] The present invention also provides a processing method using the rotary conveying indexing device described above, comprising the following steps: Initial positioning and locking stage: The servo drive motor is started, and after being reduced in speed by the planetary gear reducer, it drives the cam synchronous transmission assembly to run; the reset part of the locking cam disk rotates to contact the rocker arm lever, the compression spring assembly is in the initial state, the locking pin is inserted into the positioning pin hole of the indexing turntable, and the initial circumferential precise positioning and locking of the indexing turntable is completed; at this time, the indexing pawl of the intermittent indexing drive mechanism is in the initial position of disengaging from the indexing tooth groove, the driven part of the machining execution mechanism is located at the end of the arc-shaped guide rail, and the machining execution head is in the machining state; Indexing unlocking and engagement stage: The servo drive motor continues to rotate, and the locking cam disk of the locking cam disk pushes the L-shaped swing arm lever to rotate around its hinge point, which drives the transmission push rod to move down to stretch and compress the spring assembly, and simultaneously drives the locking pin to move down to exit the positioning pin hole, releasing the circumferential lock of the indexing turntable; At the same time, the planetary gear reducer drives the indexing lever to rotate through the torque limiting coupling, so that the eccentric indexing pawl gradually engages in one of the indexing tooth grooves on the inner side wall of the indexing turntable; In the stepping indexing and relocking stage: The indexing lever continues to rotate, and the indexing pawl drives the indexing turntable to rotate precisely around the indexing axis by a preset station angle through the indexing tooth groove, so that the workpiece to be processed is transferred with the indexing turntable to the underside of the processing execution head; at this time, the locking cam plate pushes the swing arm lever to rotate again, and the locking pin moves up and inserts into the next positioning pin hole to complete the indexing and precisely position and lock. At the same time, the indexing pawl rotates with the indexing lever, disengages from the current indexing tooth groove, and resets to the initial position to wait for the next indexing cycle; Synchronous lifting and lowering machining stage: The servo drive motor drives the main drive shaft and the cylindrical camshaft to rotate synchronously. The guide rail on the cylindrical camshaft drives the follower to reciprocate and lift vertically, thereby driving the lifting guide rod to move up and down. At the same time, the main drive shaft drives the compensation cam disk to rotate synchronously. The compensation cam disk contacts the eccentric compensation cam adjustment component, driving the compensation swing arm to overcome the tension of the reset spring and generate reciprocating swing. This, in turn, drives the switching turntable to generate additional angular displacement through the compensation drive shaft. The compensation drive shaft drives the station switching turntable to rotate around the lifting guide rod by one indexing angle. The drive paddles installed in opposite directions on the turntable cooperate with the machining execution head in sequence, driving the machining execution head to complete the up and down lifting and lowering, so as to achieve high-precision machining of the workpiece. Furthermore, it also includes online compensation for machining accuracy. When a precision deviation occurs during batch processing, the locking bolt of the phase locking block is loosened, the compensation swing arm is rotated to adjust the initial eccentric phase of the eccentric compensation cam adjuster, and the locking bolt is tightened after the adjustment is completed. Furthermore, it also includes continuous cyclic processing, with the servo drive motor rotating continuously at a constant speed, repeating steps S2 to S5 to achieve automatic rotation indexing and transfer of workpieces and continuous batch processing; when the indexing turntable jams unexpectedly, the torque limiting coupling automatically slips, cutting off the power transmission.

[0016] The beneficial effects of this invention are: (1) In this invention, a single servo drive motor is used as the only power source. Through a planetary gear reducer and a coaxial cam transmission system, four core actions are driven simultaneously: indexing, indexing locking, lifting of upper and lower double machining heads, and online compensation of machining accuracy. All actions are strictly coordinated in time through the mechanical cam profile, which reduces the cumulative error of electrical control of multi-motor drive, has high synchronization accuracy, and reduces equipment failure rate.

[0017] (2) In this invention, machining execution mechanisms are symmetrically arranged on the upper and lower sides of the indexing turntable. Two sets of machining execution heads are driven to move up and down synchronously in the same direction by the same cylindrical camshaft, so as to realize the synchronous machining of the upper and lower surfaces of the workpiece in one clamping. There is no need for manual flipping and secondary clamping, which improves production efficiency and eliminates the positioning error introduced by secondary clamping, thus improving machining accuracy.

[0018] (3) In this invention, by setting an integrated eccentric phase adjustable machining accuracy compensation mechanism, the initial phase of the eccentric compensation cam adjustment component can be adjusted, which can realize high-precision online compensation of the swing angle and lifting stroke of the machining execution head without stopping the machine for adjustment. This effectively offsets the accuracy drift caused by factors such as tool wear and thermal deformation, improves the consistency of batch processing dimensions, and reduces the defect rate.

[0019] (4) In this invention, the main drive mechanism is eccentrically set in the hollow cavity of the indexing turntable. All transmission systems and actuators are integrated in the upper and lower sides and the internal space of the indexing turntable, eliminating multiple independent drive and transmission systems. The equipment occupies less space, the number of parts is reduced, the manufacturing cost is reduced, and the structure is simple and reliable. Daily maintenance only requires regular lubrication, reducing maintenance costs.

[0020] (5) In this invention, a torque limiting coupling is set in the intermittent indexing drive mechanism. When the indexing turntable gets stuck unexpectedly, it automatically slips and cuts off the power, effectively protecting the core transmission components from damage. At the same time, a double-point symmetrical indexing locking mechanism is adopted, so that the indexing turntable is subjected to uniform force and stable positioning, avoiding the problem of turntable tilting caused by single-sided locking, and the repeatability positioning accuracy is high.

[0021] In summary, this equipment has the advantages of device integration and high degree of automation, and is especially suitable for the field of automated precision machining equipment technology. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the structure of the dual-station machining execution unit of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the structure of the dual-station machining execution unit of the present invention. Figure 2 ; Figure 5 This is a schematic diagram of the intermittent indexing drive mechanism of the present invention; Figure 6 This is a schematic diagram of the cam synchronous transmission assembly of the present invention; Figure 7 This is a schematic diagram of the indexing turntable of the present invention.

[0024] Figure 8 This is a flowchart of the continuous processing method described in this invention.

[0025] Explanation of markings in the diagram: 1-Frame assembly, 11-Main mounting plate, 12-Hollow tubular support shaft, 13-Guide plate, 2-Indexing turntable assembly, 21-Indexing turntable, 22-Positioning pin hole, 23-Workpiece mounting hole, 3-Dual-station machining execution unit, 31-Main drive assembly, 311-Servo drive motor, 312-Planetary gear reducer, 32-Machining execution mechanism, 321-Main drive shaft, 322-Cylindrical camshaft, 323-Arc-shaped guide rail, 324-Slide table body, 325-Lifting guide rod, 326-Driven component, 327-Switching turntable, 328-Drive lever, 329-Machining head mounting base, 3210-Connecting column, 33-Machining accuracy compensation machine Components: 331-Compensation mechanism mounting plate, 332-Compensation swing arm, 333-Reset tension spring, 334-Eccentric compensation cam adjuster, 335-Phase locking block, 336-Compensation cam disc, 337-Compensation drive shaft, 4-Indexing locking mechanism, 41-Transmission push rod, 42-Compression spring assembly, 43-Locking pin, 44-Stroke limit stop, 5-Intermittent indexing drive mechanism, 51-Pawl mounting seat, 52-Indexing lever, 53-Torque limiting coupling, 54-Indexing pawl, 55-Indexing tooth groove, 6-Cam synchronous transmission assembly, 61-First transmission gear, 62-Second transmission gear, 63-Locking cam disc, 64-L-type swing arm lever, 65-Synchronous connecting rod. Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0027] Example 1 like Figure 1-2 As shown, a rotary conveying indexing device includes: Rack assembly 1 is integrally cast from HT250 cast iron, possessing excellent shock absorption performance and structural rigidity; Indexing turntable assembly 2, the indexing turntable assembly 2 includes an indexing turntable 21, the indexing turntable 21 is rotatably supported on the frame assembly 1, and performs intermittent rotational motion around the indexing axis; The dual-station machining execution unit 3 includes a main drive assembly 31 located below the indexing turntable assembly 2, two sets of machining execution mechanisms 32 vertically mounted on the frame assembly 1 and correspondingly located on the upper and lower sides of the indexing turntable 21, and two sets of machining accuracy compensation mechanisms 33 respectively corresponding to the two sets of machining execution mechanisms 32. The machining accuracy compensation mechanism 33 completes the position switching action of the machining execution mechanism 32 under the drive of the main drive assembly 31, and the two sets of machining execution mechanisms 32 move up and down synchronously under the drive of the main drive assembly 31. Indexing locking mechanism 4, which is connected to the main drive assembly 31, can be intermittently inserted into the indexing turntable 21 to precisely position and lock the indexing turntable 21 circumferentially; and Intermittent indexing drive mechanism 5, which is connected to the main drive assembly 31, is used to drive the indexing turntable 21 to make precise stepping circular rotation around the indexing axis.

[0028] Example 2 like Figure 1-2 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 2 and Embodiment 1 is as follows: Furthermore, the main drive assembly 31 is fixedly mounted at the center of the upper end face of the main mounting plate 11, located within the hollow inner cavity of the indexing turntable 21. It includes a servo drive motor 311 and a planetary gear reducer 312. The input end is connected to the output shaft of the servo drive motor 311 via a diaphragm coupling, and the output end is simultaneously connected to the intermittent indexing drive mechanism 5, the machining execution mechanism 32, and the indexing locking mechanism 4.

[0029] Furthermore, the frame assembly 1 includes a main mounting plate 11, a hollow tubular support shaft 12, and a guide plate 13 arranged coaxially from bottom to top; The main drive assembly 31 is mounted on the main mounting plate 11, which is a circular thick plate structure and is fixed to the equipment foundation by anchor bolts. The hollow tubular support shaft 12 is a seamless steel pipe that coaxially runs through and is welded to the center of the main mounting plate 11. Its upper end is coaxially fixed to the guide plate 13 by bolts. The internal cavity of the hollow tubular support shaft 12 can be used to run all cables and air passages, making the overall equipment neater. The indexing turntable 21 is made of 6061-T6 aluminum alloy and is rotatably mounted on the outer periphery of the guide plate 13 via cross roller bearings, ensuring smooth rotation and strong load-bearing capacity. The indexing turntable 21 has multiple sets of positioning pin holes 22 and multiple sets of workpiece mounting holes 23 arranged from the inside out around its center. The positioning pin holes 22 and the workpiece mounting holes 23 are evenly distributed at equal angles along the circumference of the indexing turntable 21. The positioning pin holes 22 are machined by reaming. The workpiece mounting holes 23 are used to install quick-change workpiece fixtures, which can quickly change the workpiece according to different specifications.

[0030] Example 3 like Figure 6 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 3 and Embodiment 1 is as follows: Furthermore, the indexing locking mechanism 4 includes a transmission push rod 41, a compression spring assembly 42, and a locking pin 43 arranged coaxially from bottom to top; The upper end of the compression spring assembly 42 is mounted on the frame assembly, and the lower end is connected to the transmission push rod 41. It is used to apply a continuous upward elastic preload to the locking pin 43. The upper end of the locking pin 43 is machined with a 15° guide chamfer to facilitate insertion into the positioning pin hole 22; The upper end of the locking pin 43 is provided with a travel limit block 44, the upper end face of the travel limit block 44 intermittently abutting against the lower end face of the guide plate 13, which is used to limit the maximum upward travel of the locking pin 43.

[0031] Furthermore, the indexing locking mechanism 4 is driven by the cam synchronous transmission assembly 6, which includes: A synchronous drive unit, comprising a first transmission gear 61 synchronously driven with the output shaft of the servo drive motor 311, a second transmission gear 62 externally meshing with the first transmission gear 61 and coaxially rotating with the planetary gear reducer 312, and a locking cam disk 63 coaxially fixedly connected to the second transmission gear 62 and rotating synchronously; and The lever transmission unit includes an L-shaped swing arm lever 64 rotatably mounted on the main mounting plate 11. The lower end of the swing arm lever 64 intermittently abuts against the contour surface of the locking cam plate 63, and its upper end is hinged to the lower end of the transmission push rod 41.

[0032] Furthermore, both the indexing locking mechanism 4 and the lever transmission unit are provided in two sets; The two sets of indexing locking mechanisms 4 are arranged symmetrically about the center of the indexing turntable 21; The lower ends of the swing arm levers 64 of the two sets of lever transmission units are connected by a synchronous connecting rod 65 to ensure that the two sets of locking pins 43 move synchronously.

[0033] It should be noted that in existing technologies, indexing locking and rotation are driven by independent motors, which poses a risk of timing misalignment, causing inertial wobbling of the indexing turntable after rotation and resulting in generally poor repeatability. In this invention, the indexing locking mechanism and the intermittent indexing drive mechanism are driven by the same power source through coaxial gear transmission, and their action sequence is precisely bound by the gear transmission ratio and cam profile. When the indexing pawl drives the turntable to rotate, the locking cam disk rotates to the lift section, pushing the locking pin to synchronously insert into the next positioning pin hole; when the locking pin is fully inserted, the indexing pawl rotates to the position of disengaging from the tooth groove. This seamless coordination of locking upon rotation and disengagement upon locking greatly reduces the inertial wobbling of the turntable, resulting in high repeatability of the indexing turntable, an improvement over existing technologies.

[0034] Meanwhile, the indexing locking mechanism 4 is arranged symmetrically about the center of the indexing turntable 21, and the center position is determined by two points, which further ensures the accuracy of processing. Only when both sets of indexing locking mechanisms 4 are successfully inserted into the positioning pin holes 22 can the center position of the indexing turntable be guaranteed.

[0035] Example 4 like Figure 5 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as those in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 4 and Embodiment 1 is as follows: Furthermore, the intermittent indexing drive mechanism 5 includes: A pawl mounting base 51 is mounted on the guide plate 13; Indexing lever 52 passes through the pawl mounting base 51 and is rotatably mounted on the pawl mounting base 51. The lower end of the indexing lever 52 is synchronously driven with the output shaft of the planetary gear reducer 312 through a torque limiting coupling 53. Indexing pawl 54, the indexing pawl 54 being eccentrically disposed at the upper end of the indexing lever 52; and Multiple indexing grooves 55 are evenly spaced along the circumference at equal angles on the inner sidewall of the indexing turntable 21. The indexing pawl 54 can rotate into the indexing groove 55 with the indexing lever 52 to drive the indexing turntable 21 to rotate precisely by one work position angle.

[0036] It should be noted that the servo motor output shaft is simultaneously connected to the input end of the planetary gear reducer and the locking cam disc. The reducer output end is also coaxially fixed to the indexing lever, the cylindrical camshaft, and the compensating cam disc. When the motor rotates at a constant speed, the four actions are precisely matched through the phase difference of the cam profile: the indexing pawl 54 disengages only after the locking pin is fully inserted; the locking pin retracts only after the indexing pawl is fully engaged; the indexing turntable rotates only after the machining head is fully retracted; and the machining head feeds only after the indexing turntable is fully locked. This purely mechanical timing coordination results in high precision, improved system synchronization accuracy, and reduced equipment failure rate.

[0037] Example 5 like Figure 2-4 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as those in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 5 and Embodiment 1 is as follows: Furthermore, the two sets of machining actuators 32 are located on the upper and lower sides of the indexing turntable 21, respectively, and have identical structures, including: The guide assembly includes a main drive shaft 321 that rotates coaxially with the servo drive motor 311, and a cylindrical camshaft 322 that is coaxially connected to the main drive shaft 321. A continuous closed arc-shaped guide rail 323 is machined on the outer circumference of the cylindrical camshaft 322. The main drive shaft 321 is made of 40Cr material and has undergone heat treatment. Its lower end is coaxially fixedly connected to the output shaft of the planetary gear reducer 312 by a flat key, and its upper end is coaxially welded and fixed to the cylindrical camshaft 322. The lifting slide assembly includes a slide body 324 fixedly mounted on the upper end of the frame assembly 1 by bolts, a lifting guide rod 325 elastically disposed on the slide body 324 and vertically penetrating the indexing turntable 21, and a driven member 326 fixedly connected to the lifting guide rod 325 and meshing with the arc-shaped guide rail 323 to realize the lifting action. The driven member 326 adopts a roller bearing and is fixedly connected to the middle part of the lifting guide rod 325 by a pin. Its roller is embedded in the arc-shaped guide rail 323 and rolls with it. The processing head switching assembly has two sets symmetrically arranged at both ends of the lifting guide rod 325. The processing head switching assembly includes a switching turntable 327 rotatably mounted on the lifting guide rod 325 via a steel sleeve, several sets of drive paddles 328 equally distributed on the switching turntable 327, a processing head mounting seat 329 rotatably mounted at the end of the lifting guide rod 325 via a bearing, and two sets of connecting columns 3210 vertically arranged at both ends of the processing head mounting seat 329 and connected to the lower end of the switching turntable 327. Adjacent drive paddles 328 are installed facing opposite directions.

[0038] The switching turntable 327 is mounted on the lifting guide rod 325 via a sliding bearing, allowing it to rise and fall synchronously with the lifting guide rod 325, while also being able to rotate independently relative to the lifting guide rod 325. Drive levers 328 are evenly distributed around the outer periphery of the switching turntable 327 and are fixedly connected by bolts. The machining head mounting base 329 is rotatably mounted on the end of the lifting guide rod 325 via an angular contact ball bearing. Two sets of connecting posts 3210 are vertically welded to the inner end of the machining head mounting base 329, with their ends slidingly engaging with the end face of the switching turntable 327 to limit the axial movement of the switching turntable 327.

[0039] The dual-station machining execution unit 3 is the core part of this invention. The principle of realizing the lifting and lowering action of the machining execution head by switching two adjacent sets of drive paddles 328 has been disclosed in the patent with patent number ES2043345 and title "Intermittent rotary workpiece clamping worktable machine tool for rapid machining and assembly of high-precision parts". It belongs to the prior art and will not be described in detail here.

[0040] Example 6 like Figure 2-4 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as those in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 6 and Embodiment 1 is as follows: Furthermore, the machining accuracy compensation mechanism 33 includes: The compensation mechanism mounting plate 331 is a hollow structure and is coaxially fixedly mounted on the guide plate 13. The compensation swing arm 332 is rotatably mounted on the compensation mechanism mounting plate 331 via a reset spring 333. An eccentric compensation cam adjustment component 334 is rotatably mounted on the compensation swing arm 332. The two ends of the reset spring 333 are respectively hooked onto the hanging columns of the compensation swing arm 332 and the compensation mechanism mounting plate 331. Position locking block 335, which is installed on the compensation mechanism mounting plate 331 by locking bolts, is used to lock the compensation swing arm 332 to fix the initial phase position of the compensation cam adjuster 334; A compensating cam disk 336 is coaxially connected to the main drive shaft 321 and guides the outer circumferential surface of the compensating cam adjuster 334 to drive the compensating swing arm 332 to perform reciprocating oscillating motion; and The compensation drive shaft 337 is fixedly installed on the compensation swing arm 332 and passes through the switching turntable 327.

[0041] The eccentric compensation cam adjuster 334 is an eccentric shaft structure with an eccentricity of 1-2mm. It is rotatably mounted on one end of the compensation arm 332 via bearings, with its eccentric shaft end extending outward from the compensation arm 332 and fixedly connected to an adjusting nut. The phase locking block 335 is an arc-shaped plate structure, mounted on the compensation mechanism mounting plate 331 via locking bolts. When the locking bolts are tightened, the end face of the phase locking block 335 presses against the side wall of the compensation arm 332, achieving phase locking. The compensation cam disk 336 is coaxially welded and fixed to the main drive shaft 321, with its contour surface rolling in contact with the outer circumferential surface of the eccentric compensation cam adjuster 334. The compensation drive shaft 337 is a stainless steel shaft, horizontally welded and fixed to the other end of the compensation arm 332, with its end extending into the radial drive hole of the switching turntable 327.

[0042] In existing technologies, double-sided machining requires secondary clamping or dual-power drive, resulting in low efficiency, poor accuracy, and easy workpiece deformation. In this invention, the upper and lower machining actuators are driven by the same cylindrical camshaft. Through the symmetrical design of a sinusoidal arc-shaped guide rail, the upper and lower machining heads move synchronously and in the same direction. When the upper machining head feeds downwards, the lower machining head feeds upwards synchronously. Their feed speeds and strokes are completely consistent, and the forces exerted on the workpiece cancel each other out, preventing workpiece deformation. Simultaneously, the indexing turntable's rotation is precisely synchronized with the machining head's retraction. When the machining head is fully retracted to a safe position, the indexing turntable begins its rotation, preventing tool interference. This collaborative mechanism improves production efficiency while effectively reducing secondary clamping errors and enhancing machining accuracy.

[0043] Example 7 like Figure 8 As shown, components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences from Embodiment 1 are described below. The difference between Embodiment 7 and Embodiment 1 is as follows: A processing method using the rotary conveying indexing device as described in Embodiment 1 includes the following steps: Initial positioning and locking stage: The servo drive motor 311 is started, and after being reduced in speed by the planetary gear reducer 312, it drives the cam synchronous transmission assembly 6 to rotate; the reset part of the locking cam disk 63 rotates to contact the rocker arm lever 64, the compression spring assembly 42 is in the initial state, the locking pin 43 is inserted into the positioning pin hole 22 of the indexing turntable 21, and the initial circumferential precise positioning and locking of the indexing turntable 21 is completed; at this time, the indexing pawl 54 of the intermittent indexing drive mechanism 5 is in the initial position of disengaging from the indexing tooth groove 55, and when the follower 326 of the machining execution mechanism 32 is in the highest or lowest position of the arc guide rail 323, the machining execution head is in the switching state of machining completion; During the indexing unlocking and engagement stage: the servo drive motor 311 continues to rotate, and the locking cam disk of the locking cam disk 63 pushes the L-shaped swing arm lever 64 to rotate around its hinge point, which drives the transmission push rod to move down to stretch and compress the spring assembly 42, and simultaneously drives the locking pin 43 to move down to exit the positioning pin hole 22, releasing the circumferential lock of the indexing turntable 21; at the same time, the planetary gear reducer 312 drives the indexing lever 52 to rotate through the torque limiting coupling 53, so that the eccentric indexing pawl 54 gradually engages in one of the indexing tooth grooves 55 on the inner side wall of the indexing turntable 21; In the stepping indexing and relocking stage: the indexing lever 52 continues to rotate, and the indexing pawl 54 drives the indexing turntable 21 to rotate precisely around the indexing axis by a preset station angle through the indexing tooth groove 55, so that the workpiece to be processed is transferred with the indexing turntable 21 to the underside of the processing execution head; at this time, the locking cam disk 63 pushes the swing arm lever 64 to rotate again, and the locking pin 43 moves upward and inserts into the next positioning pin hole 22 to complete the indexing and precisely position and lock. At the same time, the indexing pawl 54 rotates with the indexing lever 52, disengages from the current indexing tooth groove 55, and resets to the initial position to wait for the next indexing cycle; Synchronous lifting and lowering machining stage: Servo drive motor 311 drives main drive shaft 321 and cylindrical camshaft 322 to rotate synchronously. Guide rail 323 on cylindrical camshaft 322 drives follower 326 to reciprocate and lift in the vertical direction, thereby driving lifting guide rod 325 to move up and down. At the same time, compensation cam disk 336 rotates synchronously with main drive shaft 321, and pushes compensation cam adjustment component 334 through contour surface to drive compensation swing arm 332 to swing back and forth. Compensation drive shaft 337 drives station switching turntable 327 to rotate around lifting guide rod 325 by one indexing angle. Drive paddles 328 installed in opposite directions on the turntable cooperate with machining execution head in sequence to drive machining execution head to complete up and down lifting and lowering, so as to achieve high-precision machining of workpiece.

[0044] Precision compensation: When a precision deviation occurs during batch processing, the machine is stopped and the locking bolt of the phase locking block 335 is loosened. The adjusting nut is rotated to adjust the initial phase of the eccentric compensation cam adjusting component 334. After the adjustment is completed, the locking bolt is tightened. After restarting, the compensation cam disk 336 drives the compensation swing arm 332 to swing, which drives the switching turntable 327 through the compensation drive shaft 337 to generate additional angular displacement, thereby realizing online compensation of processing precision.

[0045] Unloading: The finished workpiece rotates with the indexing turntable 21 to the unloading station, where it is taken out by the automatic loading and unloading mechanism, completing one processing cycle.

[0046] In the description of this invention, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0047] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0048] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art under the technical guidance of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A rotary conveying indexing device, comprising: Rack assembly; Indexing turntable assembly, the indexing turntable assembly including an indexing turntable rotatably supported on the frame assembly to perform intermittent rotational motion around the indexing axis; Its characteristic is that it further includes: The dual-station machining execution unit includes a main drive assembly located below the indexing turntable assembly, two sets of machining execution mechanisms vertically and elevatingly mounted on the frame assembly and correspondingly located on the upper and lower sides of the indexing turntable, and two sets of machining accuracy compensation mechanisms respectively corresponding to the two sets of machining execution mechanisms. The machining accuracy compensation mechanism completes the position switching action of the machining execution mechanism under the drive of the main drive assembly, and the two sets of machining execution mechanisms move up and down synchronously under the drive of the main drive assembly. The indexing locking mechanism, which is connected to the main drive assembly, can be intermittently inserted into the indexing turntable to precisely position and lock the indexing turntable circumferentially; and An intermittent indexing drive mechanism is connected to the main drive assembly and is used to drive the indexing turntable to make precise stepping circular rotations around the indexing axis.

2. The rotary conveying indexing device according to claim 1, characterized in that, The main drive assembly includes: A servo drive motor, wherein the servo drive motor is eccentrically disposed within the hollow inner cavity of the indexing turntable; and A planetary gear reducer, wherein the input end of the planetary gear reducer is connected to the output shaft of the servo drive motor.

3. The rotary conveying indexing device according to claim 1, characterized in that, The rack assembly includes a main mounting plate, a hollow tubular support shaft, and a guide plate arranged coaxially from bottom to top; The main drive assembly is mounted on the main mounting plate, and the indexing turntable is rotatably fitted around the outer periphery of the guide plate; The indexing turntable has multiple sets of locating pin holes and multiple sets of workpiece mounting holes arranged from the inside out, with its center as the center. The locating pin holes and the workpiece mounting holes are evenly distributed at equal angles along the circumference of the indexing turntable.

4. The rotary conveying indexing device according to claim 3, characterized in that, The indexing locking mechanism includes a transmission push rod, a compression spring assembly, and a locking pin arranged coaxially from bottom to top. The upper end of the compression spring assembly is mounted on the frame assembly, and the lower end is connected to the transmission push rod, which is used to apply a continuous upward elastic preload to the locking pin; The upper end of the locking pin is matched and inserted into the positioning pin hole; The upper end of the locking pin is provided with a travel limit block, and the upper end face of the travel limit block intermittently abuts against the lower end face of the guide plate to limit the maximum upward travel of the locking pin.

5. The rotary conveying indexing device according to claim 2, characterized in that, The indexing locking mechanism is driven by a cam synchronous transmission assembly, which includes: A synchronous drive unit, comprising a first transmission gear synchronously driven with the output shaft of the servo drive motor, a second transmission gear externally meshing with the first transmission gear and rotating coaxially with the planetary gear reducer, and a locking cam disk coaxially fixedly connected to the second transmission gear and rotating synchronously; and The lever transmission unit includes an L-shaped swing arm lever rotatably mounted on the main mounting plate. The lower end of the swing arm lever intermittently abuts against the contour surface of the locking cam plate, and its upper end is hinged to the lower end of the transmission push rod.

6. The rotary conveying indexing device according to claim 5, characterized in that, Both the indexing locking mechanism and the lever transmission unit are provided in two sets; The two sets of indexing locking mechanisms are arranged symmetrically about the center of the indexing turntable; The lower ends of the swing arm levers of the two sets of lever transmission units are connected by a synchronous connecting rod.

7. The rotary conveying indexing device according to claim 3, characterized in that, The intermittent indexing drive mechanism includes: A pawl mounting base is mounted on the guide plate; The indexing lever passes through the pawl mounting base and is rotatably mounted on the pawl mounting base. The lower end of the indexing lever is synchronously driven with the output shaft of the planetary gear reducer through a torque limiting coupling. Indexing pawl, the indexing pawl being eccentrically disposed at the upper end of the indexing lever; and Multiple indexing grooves are evenly spaced at equal angles along the circumference of the inner wall of the indexing turntable. The indexing pawl can rotate with the indexing lever and enter the indexing grooves to drive the indexing turntable to rotate precisely by one work position angle.

8. The rotary conveying indexing device according to claim 2, characterized in that, The processing actuator includes: The guide assembly includes a main drive shaft that rotates coaxially with the servo drive motor, and a cylindrical camshaft that is coaxially connected to the main drive shaft. A continuous closed arc-shaped guide rail is machined on the outer circumferential surface of the cylindrical camshaft. The lifting slide assembly includes a slide body mounted on the upper end of the frame assembly, a lifting guide rod elastically disposed on the slide body and vertically penetrating the indexing turntable, and a driven member fixedly connected to the lifting guide rod and engaging with the arc-shaped guide rail to realize the lifting action. The machining head switching assembly comprises two sets of symmetrically arranged at both ends of the lifting guide rod. The machining head switching assembly includes a switching turntable rotatably mounted on the lifting guide rod via a steel sleeve, several sets of drive paddles equally distributed on the switching turntable, a machining head mounting seat rotatably mounted at the end of the lifting guide rod via a bearing, and two sets of connecting columns vertically arranged at both ends of the machining head mounting seat and connected to the lower end of the switching turntable. Adjacent drive paddles are installed facing opposite directions.

9. The rotary conveying indexing device according to claim 8, characterized in that, The machining accuracy compensation mechanism includes: The compensation mechanism mounting plate is a hollow structure and is coaxially fixedly mounted on the guide plate. A compensation swing arm is rotatably mounted on the compensation mechanism mounting plate via a return spring, and an eccentric compensation cam adjustment component is rotatably mounted on the compensation swing arm. A position locking block is mounted on the compensation mechanism mounting plate by a locking bolt, and is used to lock the compensation swing arm to fix the initial phase position of the compensation cam adjuster. A compensating cam disk, coaxially connected to the main drive shaft and in guiding contact with the outer circumferential surface of the compensating cam adjusting member, drives the compensating swing arm to perform reciprocating oscillating motion; and A compensation drive shaft is fixedly mounted on the compensation swing arm and passes through the switching turntable.

10. A processing method using the rotary conveying indexing device as described in any one of claims 1-9, characterized in that, Includes the following steps: Initial positioning and locking stage: The servo drive motor is started, and after being reduced in speed by the planetary gear reducer, it drives the cam synchronous transmission assembly to run; the reset part of the locking cam disk rotates to contact the rocker arm lever, the compression spring assembly is in the initial state, the locking pin is inserted into the positioning pin hole of the indexing turntable, and the initial circumferential precise positioning and locking of the indexing turntable is completed; at this time, the indexing pawl of the intermittent indexing drive mechanism is in the initial position of disengaging from the indexing tooth groove, the driven part of the machining execution mechanism is located at the end of the arc-shaped guide rail, and the machining execution head is in the machining state; During the indexing unlocking and engagement phase: the servo drive motor continues to rotate, and the locking cam disk of the locking cam disk pushes the L-shaped swing arm lever to rotate around its hinge point, which drives the transmission push rod to move down to stretch and compress the spring assembly, and simultaneously drives the locking pin to move down to exit the positioning pin hole, releasing the circumferential lock of the indexing turntable; at the same time, the planetary gear reducer drives the indexing lever to rotate through the torque limiting coupling, so that the eccentric indexing pawl gradually engages in one of the indexing tooth grooves on the inner side wall of the indexing turntable; In the stepping indexing and relocking stage: The indexing lever continues to rotate, and the indexing pawl drives the indexing turntable to rotate precisely around the indexing axis by a preset station angle through the indexing tooth groove, so that the workpiece to be processed is transferred with the indexing turntable to the underside of the processing execution head; at this time, the locking cam plate pushes the swing arm lever to rotate again, and the locking pin moves up and inserts into the next positioning pin hole to complete the indexing and precisely position and lock. At the same time, the indexing pawl rotates with the indexing lever, disengages from the current indexing tooth groove, and resets to the initial position to wait for the next indexing cycle; Synchronous lifting and lowering machining stage: The servo drive motor drives the main drive shaft and the cylindrical camshaft to rotate synchronously. The guide rail on the cylindrical camshaft drives the follower to reciprocate and lift vertically, thereby driving the lifting guide rod to move up and down. At the same time, the compensation cam disk rotates synchronously with the main drive shaft. Through the contour surface, it pushes the compensation cam adjustment component to drive the compensation swing arm to swing back and forth. The compensation drive shaft drives the station switching turntable to rotate around the lifting guide rod by one indexing angle. The drive paddles installed in opposite directions on the turntable cooperate with the machining execution head in sequence, driving the machining execution head to complete the up and down lifting and lowering to achieve high-precision machining of the workpiece.

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