An injection molding fixture for the production of precision electronic connectors

Abstract

The present invention relates to the technical field of injection molding fixtures, and discloses an injection molding fixture for the production of precision electronic connectors, comprising an injection molding machine, an injection molding frame connected to the injection molding machine, a six-degree-of-freedom robotic arm mounted on the injection molding frame, and a trimming box, wherein the six-degree-of-freedom robotic arm is mounted with a motion generating component driven by a servo motor, the motion generating component is connected with a double-moving frame that can synchronously move up and down and left and right and an alternating shaft that can alternately rotate forward and reverse, the reciprocating stroke and reciprocating frequency of the double-moving frame cyclically change, the alternating shaft is rotatably mounted on the double-moving frame, and a hinge seat is mounted at the bottom end of the alternating shaft. The present invention innovatively realizes a composite three-dimensional dynamic trajectory of "dynamic spiral, tilt, and micro-area coverage", and through the composite three-dimensional dynamic trajectory, the module is made to move in multiple dimensions in the trimming fluid, thoroughly covering traditional blind spots such as module edges and module curved surfaces, thereby improving polishing efficiency, reducing burr residual rate, and significantly improving the surface accuracy of precision electronic connector injection molding modules.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding fixtures, and more particularly to an injection molding fixture for producing precision electronic connectors. Background Art

[0002] As one of the core components of electronic equipment, the molding quality of precision electronic connectors directly affects the signal transmission stability and service life of the equipment. In the injection molding process of electronic connectors, the injection molding fixture is a key device connecting the injection molding machine and the subsequent finishing process. Its function not only includes the precise clamping of the molding module, but also requires dynamic motion control to achieve module surface polishing and edge burr trimming.

[0003] Prior art patent application CN116811160A discloses a blanking fixture for an injection molding machine. This fixture utilizes a base, a fixed shaft, a connecting sleeve, and a clamping member to facilitate blanking of plastic barrels, improving blanking efficiency to a certain extent. However, as precision electronic connectors continue to face increasing demands for surface accuracy, edge burrs, and complex curved surface processing, existing fixture technology has gradually exposed the following key issues:

[0004] Existing technologies are not convenient for completing the trimming operation of precision electronic connector modules simultaneously with the cutting process. Although some trimming devices using trimming fluids have appeared on the market, the existing trimming devices have a single motion trajectory, incomplete trimming coverage, and lack closed-loop detection and dynamic adjustment mechanisms during trimming.

[0005] Based on this, the present invention provides an injection molding fixture for producing precision electronic connectors to solve the technical problems raised in the above background technology. Summary of the Invention

[0006] In order to overcome the shortcomings of the existing technology, the present invention provides an injection molding fixture for the production of precision electronic connectors. The present invention innovatively realizes a composite three-dimensional dynamic trajectory of "dynamic spiral, tilt, and micro-area coverage". Through the composite three-dimensional dynamic trajectory, the module is made to move in multiple dimensions in the dressing fluid, completely covering traditional blind spots such as the module edge and module surface, thereby improving the polishing efficiency, reducing the burr residual rate, and significantly improving the surface accuracy of the injection molding module of the precision electronic connector.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an injection molding fixture for the production of precision electronic connectors, comprising an injection molding machine, an injection molding frame connected to the injection molding machine, a six-degree-of-freedom robotic arm mounted on the injection molding frame, and a trimming box, the six-degree-of-freedom robotic arm being mounted on a motion generating component driven by a servo motor, the motion generating component being connected to a double-moving frame that can synchronously move up and down and left and right, and an alternating shaft that can alternately rotate forward and reverse, the reciprocating stroke and reciprocating frequency of the double-moving frame being cyclically changed, the alternating shaft being rotatably mounted on the double-moving frame, and the alternating shaft being A hinge seat is installed at the bottom end, and an upper gear ring and a lower gear ring are installed on the hinge seat respectively. A swing frame is provided on the hinge seat, which is driven by the upper gear ring and can swing back and forth within 45 degrees. A reversing shaft that can rotate alternately forward and reverse is provided on the swing frame. A shaft seat is installed at the bottom end of the swing frame, and a clamping frame that can swing back and forth within ±45 degrees is rotatably installed on the shaft seat. The clamping frame is provided with a three-axis positioning system and an electric clamping part for clamping the electronic connector molding module. A dressing liquid for dressing and polishing the electronic connector molding module is provided in the dressing box. The injection molding frame is provided with a detection element and a hot air blower.

[0008] After the electronic connector is injection molded, the module parameters are obtained through a visual inspection of the detection element and the working parameters of the servo motor of the motion generating component are adjusted through feedback. The motion generating component drives the double-moving frame to work, so that the electronic connector molding module forms a composite three-dimensional dynamic trajectory of "dynamic spiral, tilt, and micro-area coverage" in the trimming fluid to complete polishing and edge trimming. After trimming and polishing, it is dried with hot air and subjected to a second visual inspection to form a closed-loop processing flow.

[0009] As a preferred technical solution of the present invention, the motion generating component includes an end effector frame driven by a six-degree-of-freedom robotic arm, a single-motion frame, a vertical lead screw rotatably connected to the end effector frame, a follower inner shaft, and a horizontal lead screw rotatably connected to the single-motion frame, a driving rotary sleeve, and a follower rotary sleeve. The servo motor is installed on the end effector frame, and the output shaft end of the servo motor is equipped with a driving inner shaft. The driving rotary sleeve is driven by the driving inner shaft, and the follower rotary sleeve is driven by the follower inner shaft. The driving rotary sleeve is respectively equipped with a first toothless gear ring and a second toothless gear ring, and the driving rotary sleeve is provided with a first toothless gear ring. Two symmetrically arranged meshing interruption areas are provided at positions corresponding to the first toothless gear ring and the second toothless gear ring. Two full-tooth gears are installed on the follower rotary sleeve. The two full-tooth gears are respectively meshed and connected with the first toothless gear ring and the second toothless gear ring. The horizontal lead screw is transmission-connected with the double-moving frame. The vertical lead screw, the horizontal lead screw and the alternating shaft are all driven by the follower rotary sleeve. The rotation connection between the vertical lead screw and the end actuator frame, the rotation connection between the horizontal lead screw and the single-moving frame, the rotation connection between the alternating shaft and the double-moving frame, and the rotation connection between the clamping frame and the shaft seat are all provided with a first helical torsion spring.

[0010] As a preferred technical solution of the present invention, the radii of the first toothless gear ring and the second toothless gear ring and the radii of the two full-tooth gears are the same, the radius of the first toothless gear ring is 11 times to 14 times the radius of the full-tooth gear, the center angle corresponding to the effective meshing section of the first toothless gear ring is 195°, the center angle corresponding to the effective meshing section of the second toothless gear ring is 105°, and the center angles corresponding to the two meshing interruption zones are both 30°.

[0011] As an optimal technical solution of the present invention, the driving rotary sleeve is fixedly provided with a main shaft groove at both ends which is passed through and is slidably connected to the driving inner shaft, and the following rotary sleeve is fixedly provided with a secondary shaft groove at both ends which is passed through and is slidably connected to the following inner shaft. The cross sections of the main shaft groove, secondary shaft groove, driving inner shaft and following inner shaft are all regular polygonal structures. A first transmission toothed belt is connected to the following inner shaft and the vertical screw. A synchronous shaft is rotatably installed on the single moving frame. A first bevel gear is installed on the synchronous shaft and the horizontal screw. The two first bevel gears are orthogonally meshed. An elastic transmission toothed belt is installed on the following rotary sleeve for transmission. The synchronous shaft, following rotary sleeve and alternating shaft are all transmission-connected with the elastic transmission toothed belt. The elastic transmission toothed belt is made of elastic rubber and can be elastically stretched.

[0012] As a preferred technical solution of the present invention, swing shafts are installed on both sides of the swing frame, a sleeve shaft is rotatably sleeved on one of the swing shafts, the other swing shaft and the sleeve shaft are rotatably connected to the hinge seat and a swing bevel gear is installed on the swing shaft, a group of toothed segments and a group of toothless segments are provided on the upper gear ring, a group of toothed segments and a group of toothless segments are alternately arranged on the upper gear ring, the toothed segments are evenly distributed with first teeth meshing with the swing bevel gear, a second bevel gear is installed on the sleeve shaft and the reversing shaft, the two second bevel gears are orthogonally meshed, a third bevel gear is installed on the sleeve shaft, and the third bevel gear is transmission connected to the lower ring gear.

[0013] As a preferred technical solution of the present invention, a bevel gear ring is installed on the reversing shaft, a rocking bevel gear is installed on the clamping frame, the bevel gear ring is provided with a tooth portion, and the tooth portion is evenly distributed with second teeth that engage with the bevel gear ring. The bevel gear ring and the rocking bevel gear have the same radius, and the center angle corresponding to the tooth portion is 45°. A second helical torsion spring is fixedly provided at the rotating connection between the clamping frame and the shaft seat.

[0014] As a preferred technical solution of the present invention, the electric clamping part includes a double-headed motor integrated in the clamping frame, and the two output shaft ends of the double-headed motor are installed with clamping screws, and the two clamping screws are transmission-connected with clamps, and the two clamps are slidingly connected to the clamping frame.

[0015] As a preferred technical solution of the present invention, a microcontroller is installed on the injection molding frame, and the detection element is an industrial CCD camera. The detection element obtains the size, edge burr parameters and glossiness parameters of the injection molding module during the first visual inspection and feeds back to the microcontroller. The microcontroller sets the servo motor parameters based on the data feedback, and compares the parameters during the first visual inspection during the second inspection. If the deviation is out of tolerance, an alarm is triggered and re-trim is performed.

[0016] As a preferred technical solution of the present invention, the dressing fluid contains 5%-10% by mass of nano-silica abrasive, 3%-5% of polyethylene glycol dispersant, 1%-2% of benzotriazole rust inhibitor and the balance deionized water, the particle size of the nano-silica abrasive is 50nm-100nm, the dressing box is equipped with a temperature controller and a temperature probe, and the data end of the temperature probe is connected to the microcontroller data.

[0017] As a preferred technical solution of the present invention, the three-axis positioning system includes a three-axis acceleration sensor, an inertial measurement unit and a data processing module integrated on the clamping frame;

[0018] The three-axis acceleration sensor is fixed at the geometric center of the clamping frame, and its X, Y, and Z sensitive axes completely coincide with the three-axis coordinate system of the clamping frame, and is used to detect the linear acceleration data of the clamping frame in three orthogonal directions in real time;

[0019] The inertial measurement unit is integrated with a three-axis acceleration sensor and includes a gyroscope and a magnetometer;

[0020] The data processing module is electrically connected to the three-axis acceleration sensor and the inertial measurement unit, and has a built-in extended Kalman filter algorithm based on quaternions, which is used to fuse acceleration, angular velocity and magnetic field data to calculate the three-dimensional spatial position coordinates and attitude angle of the clamping frame;

[0021] The microcontroller on the injection molding frame receives the clamping frame position and angle data output by the data processing module, and sets the parameters when the six-degree-of-freedom mechanical arm clamps the electronic connector molding module.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the prior art, the dressing devices of traditional injection molding fixtures generally have the problems of single motion trajectory and incomplete coverage. They can only achieve linear or uniform rotational motion, which makes it difficult for areas such as module edges and complex curved surfaces to fully contact with the dressing fluid, resulting in uneven polishing effects and a high burr residual rate. The present invention innovatively realizes a composite three-dimensional dynamic trajectory of "dynamic spiral, tilt, and micro-area coverage" through the linkage design of motion-generating components. Through the composite three-dimensional dynamic trajectory, the module is made to move in multiple dimensions in the dressing fluid, thoroughly covering traditional blind spots such as module edges and module curved surfaces, thereby improving polishing efficiency, reducing burr residual rate, and significantly improving the surface accuracy of precision electronic connector injection molding modules.

[0024] 2. In the prior art, the fixture dressing process lacks a real-time detection and feedback mechanism, and only relies on preset parameter processing. It cannot cope with individual differences in modules or equipment errors, resulting in poor processing consistency and high defective rate. The present invention constructs a closed-loop processing flow through the collaboration of industrial CCD cameras and microcontrollers: primary detection: After injection molding, module size, burrs, glossiness and other parameters are obtained in real time, and fed back to the microcontroller to dynamically adjust the servo motor working parameters; secondary detection: after dressing and drying, re-inspection is carried out, and the initial parameters are compared. If the deviation is exceeded, an alarm is triggered and re-dressing is carried out. This mechanism makes the processing error traceable and the parameters adaptive, improves product consistency, reduces the defective rate, and significantly improves production efficiency and yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of an injection molding fixture for producing precision electronic connectors according to the present invention;

[0026] Figure 2 For the present invention Figure 1 Structural diagram from another perspective;

[0027] Figure 3 Schematic diagram of the structure of the six-degree-of-freedom robotic arm and servo motor of the present invention;

[0028] Figure 4 Schematic diagram of the structure of the servo motor and the upper gear ring of the present invention;

[0029] Figure 5 For the present invention Figure 4 Schematic diagram of the local enlarged structure at A in the middle;

[0030] Figure 6 It is a structural schematic diagram of the follower rotary sleeve and the driving rotary sleeve of the present invention;

[0031] Figure 7 Schematic diagram of the structure of the first helical torsion spring and the lower ring gear of the present invention;

[0032] Figure 8 Schematic diagram of the cross-sectional structure of the hinge seat and the alternating shaft of the present invention;

[0033] Figure 9 For the present invention Figure 8 Schematic diagram of the local enlarged structure at point B in the middle.

[0034] In the figure: 1. Injection molding machine; 2. Injection molding frame; 3. Six-degree-of-freedom robotic arm; 4. Trimming box; 5. Hinge seat; 6. Upper gear ring; 7. Lower gear ring; 8. Swing frame; 9. Axle seat; 10. Clamping frame; 11. Three-axis positioning system; 12. Electronic connector molding module; 13. Hot air blower; 14. Servo motor; 15. Microcontroller; 16. Electric clamping part; 17. Reversing shaft; 18. Detection element; 301. Double-action frame; 302. Alternating axis; 303. Single-action frame; 304. 4. Vertical lead screw; 305. Follower inner shaft; 306. Horizontal lead screw; 307. Drive rotary sleeve; 308. Follower rotary sleeve; 309. First toothless ring gear; 310. Second toothless ring gear; 311. Full-tooth gear; 312. First helical torsion spring; 313. Synchronous shaft; 314. Elastic transmission toothed belt; 315. End effector; 316. Drive inner shaft; 81. Swing shaft; 82. Sleeve shaft; 83. Bevel gear ring; 84. Second helical torsion spring; 85. Rocking bevel gear. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] like Figures 1 to 9 As shown, the present invention provides an injection molding fixture for producing precision electronic connectors, comprising an injection molding machine 1, an injection molding frame 2 connected to the injection molding machine 1, a six-degree-of-freedom robotic arm 3 installed on the injection molding frame 2, and a trimming box 4;

[0037] The injection molding machine 1 is used for injection molding of the electronic connector molding module 12;

[0038] The six-degree-of-freedom robotic arm 3 is equipped with a motion generating component driven by a servo motor 14. The motion generating component is connected to a double-moving frame 301 that can synchronously move up and down and left and right, and an alternating shaft 302 that can alternately rotate forward and reverse. The reciprocating stroke and reciprocating frequency of the double-moving frame 301 change cyclically, and the alternating shaft 302 is rotatably mounted on the double-moving frame 301.

[0039] The motion generating components include an end effector 315 driven by the six-degree-of-freedom manipulator 3, a single-action frame 303, a vertical lead screw 304 rotatably connected to the end effector 315, a follower inner shaft 305, a horizontal lead screw 306 rotatably connected to the single-action frame 303, a driving rotary sleeve 307, and a follower rotary sleeve 308;

[0040] The servo motor 14 is mounted on the end effector 315 . The output shaft end of the servo motor 14 is mounted with a driving inner shaft 316 . The driving rotary sleeve 307 is driven by the driving inner shaft 316 , and the follower rotary sleeve 308 is driven by the follower inner shaft 305 .

[0041] The driving sleeve 307 is internally fixed with a main shaft groove having two ends extending therethrough and slidably connected to the driving inner shaft 316. The follower sleeve 308 is internally fixed with a secondary shaft groove having two ends extending therethrough and slidably connected to the follower inner shaft 305. The cross-sections of the main shaft groove, secondary shaft groove, driving inner shaft 316 and follower inner shaft 305 are all regular polygonal structures.

[0042] The driving rotary sleeve 307 is respectively mounted with a first toothless gear ring 309 and a second toothless gear ring 310. The driving rotary sleeve 307 is provided with two symmetrically arranged meshing interruption areas at positions corresponding to the first toothless gear ring 309 and the second toothless gear ring 310.

[0043] Two full-tooth gears 311 are mounted on the follower rotating sleeve 308 , and the two full-tooth gears 311 are meshed with the first toothless ring gear 309 and the second toothless ring gear 310 , respectively.

[0044] The radii of the first toothless gear ring 309 and the second toothless gear ring 310 are the same as the radii of the two fully toothed gears 311. The radius of the first toothless gear ring 309 is 11 times the radius of the fully toothed gear 311. The center angle corresponding to the effective meshing section of the first toothless gear ring 309 is 195°, the center angle corresponding to the effective meshing section of the second toothless gear ring 310 is 105°, and the center angles corresponding to the two meshing interruption zones are both 30°.

[0045] The horizontal lead screw 306 is in transmission connection with the double-moving frame 301. The vertical lead screw 304, the horizontal lead screw 306, and the alternating shaft 302 are all driven by a follower rotary sleeve 308. A first helical torsion spring 312 is provided at the rotational connection between the vertical lead screw 304 and the end effector frame 315, the rotational connection between the horizontal lead screw 306 and the single-moving frame 303, the rotational connection between the alternating shaft 302 and the double-moving frame 301, and the rotational connection between the clamping frame 10 and the shaft seat 9.

[0046] A first transmission toothed belt is connected between the follower inner shaft 305 and the vertical lead screw 304. A synchronous shaft 313 is rotatably mounted on the single-moving frame 303. The synchronous shaft 313 and the horizontal lead screw 306 are both mounted with first bevel gears. The two first bevel gears are orthogonally meshed. An elastic transmission toothed belt 314 is installed on the follower rotary sleeve 308. The synchronous shaft 313, the follower rotary sleeve 308 and the alternating shaft 302 are all connected to the elastic transmission toothed belt 314. The elastic transmission toothed belt 314 is made of elastic rubber and can be elastically stretched.

[0047] The servo motor 14 drives the inner shaft 316 to rotate, driving the driving rotary sleeve 307 to rotate. The first toothless ring gear 309 and the second toothless ring gear 310 on the driving rotary sleeve 307 are respectively engaged with the full-tooth gear 311 on the follower rotary sleeve 308. Due to the different center angles of the effective meshing sections of the first toothless ring gear 309 and the second toothless ring gear 310, the follower rotary sleeve 308 will produce periodic speed change rotation.

[0048] The follower rotary sleeve 308 drives the vertical screw 304 to rotate through the first transmission toothed belt, so that the end effector 315 drives the double-acting frame 301 to move up and down;

[0049] At the same time, the follower rotary sleeve 308 drives the synchronous shaft 313 through the elastic transmission toothed belt 314, and the horizontal screw 306 is rotated through the first bevel gear, driving the double-moving frame 301 to move left and right, and the reciprocating stroke and frequency of the double-moving frame 301 change cyclically.

[0050] The follower rotary sleeve 308 also drives the alternating shaft 302 to rotate alternately forward and reversely through the elastic transmission toothed belt 314, realizing the synchronous up-and-down and left-and-right reciprocating movement of the double-moving frame 301 and the linkage of the alternating shaft 302 to rotate alternately forward and reversely, providing a power basis for the subsequent composite motion of the module in the finishing fluid, enabling the module to form a complex motion trajectory, improving the finishing and polishing effect, solving the problems of single fixture motion and incomplete finishing and polishing in the prior art, and more efficiently performing multi-dimensional motion control on the electronic connector molding module 12 compared to the prior art, thereby improving processing accuracy and quality;

[0051] The bottom end of the alternating shaft 302 is mounted with a hinge seat 5, on which are mounted an upper gear ring 6 and a lower gear ring 7, respectively. The hinge seat 5 is provided with a swing frame 8 driven by the upper gear ring 6 and capable of reciprocating within 45°. A reversing shaft 17 capable of alternating forward and reverse rotation is rotatably sleeved on the swing frame 8. The bottom end of the swing frame 8 is mounted with a shaft seat 9, on which a clamping frame 10 capable of reciprocating within ±45° is rotatably mounted. The clamping frame 10 is provided with a three-axis positioning system 11 and an electric clamping member 16 for clamping the electronic connector molding module 12.

[0052] Both sides of the swing frame 8 are equipped with swing shafts 81, a sleeve shaft 82 is rotatably sleeved on one swing shaft 81, and the other swing shaft 81 and the sleeve shaft 82 are rotatably connected to the hinge seat 5. A swing bevel gear is installed on the swing shaft 81, and a group of toothed segments and a group of toothless segments are provided on the upper gear ring 6. The group of toothed segments and the group of toothless segments are alternately arranged on the upper gear ring 6;

[0053] The toothed section is evenly distributed with first teeth that mesh with the swing bevel gear. The sleeve shaft 82 and the reversing shaft 17 are both equipped with second bevel gears. The two second bevel gears are orthogonally meshed. The sleeve shaft 82 is equipped with a third bevel gear that is in transmission connection with the lower ring gear 7.

[0054] A bevel gear ring 83 is mounted on the reversing shaft 17, and a rocking bevel gear 85 is mounted on the clamping frame 10. The bevel gear ring 83 is provided with a tooth portion, and the tooth portion is uniformly distributed with second teeth that mesh with the bevel gear ring 83. The radius of the bevel gear ring 83 and the rocking bevel gear 85 are the same, and the center angle corresponding to the tooth portion is 45°. A second helical torsion spring 84 is fixedly provided at the rotational connection between the clamping frame 10 and the shaft seat 9;

[0055] Alternating shaft 302 rotates to drive the hinge seat 5, the upper ring gear 6 on the hinge seat 5 rotates with the hinge seat 5, the toothed segment of the upper ring gear 6 meshes with the swing bevel gear, driving the swing shaft 81 drives the swing frame 8 to reciprocate within 45 °;

[0056] At the same time, the lower ring gear 7 on the hinge seat 5 rotates, and the reversing shaft 17 rotates alternately forward and reverse through the third bevel gear, the sleeve shaft 82 and the second bevel gear.

[0057] When the swing frame 8 swings, the reversing shaft 17 drives the bevel gear ring 83 to rotate, the teeth of the bevel gear ring 83 mesh with the rocking bevel gear 85, driving the clamping frame 10 to rock back and forth within ± 45 °, thereby achieving the rocking of the clamping frame 10 and the rotation linkage of the reversing shaft 17;

[0058] This structural design enables the clamped electronic connector molding module 12 to not only move up and down and left and right reciprocatingly with the double-moving frame 301 and rotate with the alternating shaft 302 in the trimming fluid, but also enables the swing frame 8 to swing and the clamping frame 10 to shake, forming a composite three-dimensional dynamic trajectory of "dynamic spiral, tilt, and micro-area coverage", thereby comprehensively polishing and trimming the module. This solves the problem in the prior art that the module has a single motion trajectory during the trimming process and cannot fully contact the trimming fluid for efficient trimming. Compared with the prior art, this greatly improves the comprehensiveness and precision of the trimming, ensuring the surface quality of the module.

[0059] In terms of uniqueness, the angle ratio of the first toothless gear ring 309, the second toothless gear ring 310 and the full-tooth gear 311 is such that the first toothless gear ring 309 has an effective meshing center angle of 195°, the second toothless gear ring 310 has an effective meshing center angle of 105°, and the non-meshing interruption area is 30° each, totaling 360° to form a complete circular motion cycle.

[0060] The asymmetric effective meshing angle of 195°:105° is used to make the follower rotary sleeve 308 rotate at a periodic speed, driving the double-moving frame 301 to change the movement stroke and frequency cyclically. If a symmetrical angle or an angle difference is too small, the expected effect cannot be achieved.

[0061] The swing frame 8 limits the maximum swing amplitude when swinging back and forth at 45° to ensure that the swing frame 8 does not deviate from the constraint range of the hinge seat 5. The 10±45° reciprocating shaking of the clamping frame complements the swing angle of the swing frame 8, so that the module forms a compound motion to cover the dead angle. Angles exceeding 45° may cause mechanical interference, and angles that are too small cannot be fully trimmed.

[0062] In terms of irreplaceability, the angles of the first toothless ring gear 309 and the second toothless ring gear 310 are asymmetrically meshed to enable the double-moving frame 301 to generate variable acceleration motion to form a "dynamic spiral" trajectory, thus overcoming the problem of uneven finishing caused by the single uniform motion of the traditional fixture. If a gear rack, cam mechanism or electronic speed control servo motor 14 is used instead, there are disadvantages such as complex structure, high cost and delayed response.

[0063] The angle between the swing frame 8 and the clamping frame 10 makes the module produce an inclination angle and slight vibration, solving the problem of edge and complex surface trimming in traditional processes. If only a single movement or multi-axis robot control is used, the comprehensiveness of the trimming will be reduced or the cost will be high and the space occupied will be large;

[0064] In terms of creativity, the realization of complex motion trajectories through purely mechanical structures without the need for high-cost electronic servo systems, and the conversion of the "angle difference" of gear transmission into the "dimensional difference" of motion trajectories, is an interdisciplinary innovation in mechanical design;

[0065] The angle parameters are linked with the visual inspection system to form a closed loop of "inspection, motion control, and re-inspection", realizing "physical structure parameterization" to improve processing flexibility;

[0066] The compound angle motion creates a turbulent effect on the module in the finishing fluid, which, combined with the temperature-controlled finishing fluid, improves polishing efficiency.

[0067] The electric clamping member 16 includes a double-headed motor integrated in the clamping frame 10. The two output shaft ends of the double-headed motor are both equipped with clamping screws. The two clamping screws are both transmission-connected to clamps. The two clamps are both slidably connected to the clamping frame 10.

[0068] The double-headed motor of the electric clamping member 16 drives the two clamping screws to rotate, driving the clamp to slide on the clamping frame 10 to achieve stable clamping and release of the electronic connector molding module 12;

[0069] This clamping method is easy to operate, has uniform clamping force, and can be flexibly adjusted according to the size and shape of the module, ensuring that the module remains stable during complex movements, avoiding module damage or poor trimming results due to unstable clamping. It solves the problems of poor stability and insufficient adaptability of clamping devices in existing technologies. Compared with existing technologies, it improves the compatibility of the fixture with modules of different specifications and improves stability during processing.

[0070] The finishing box 4 is provided with a finishing liquid for finishing and polishing the electronic connector molding module 12, and the injection molding frame 2 is provided with a detection element 18 and a hot air blower 13;

[0071] After the electronic connector is injection molded, the detection element 18 is used for a visual inspection to obtain the module parameters and feedback is given to adjust the working parameters of the servo motor 14 of the motion generating component. The motion generating component drives the double-moving frame 301 to work, so that the electronic connector molding module 12 forms a composite three-dimensional dynamic trajectory of "dynamic spiral, tilt, and micro-area coverage" in the trimming fluid to complete polishing and edge trimming. After trimming and polishing, it is dried with hot air and visually inspected twice to form a closed-loop processing flow.

[0072] A microcontroller 15 is installed on the injection molding frame 2, and the detection element 18 is an industrial CCD camera. During the first visual inspection, the size, edge burr parameters and glossiness parameters of the injection molding module are obtained and fed back to the microcontroller 15. The microcontroller 15 sets the parameters of the servo motor 14 based on the data feedback. During the second inspection, the parameters of the first visual inspection are compared. If there is a deviation, an alarm is triggered and the servo motor 14 working parameters are readjusted and adjusted for a second time.

[0073] The dressing fluid contains 8% by mass of nano-silica abrasive, 4% of polyethylene glycol dispersant, 1.5% of benzotriazole rust inhibitor and the balance of deionized water. The particle size of the nano-silica abrasive is 80 nm. The dressing box 4 is equipped with a temperature controller and a temperature probe. The data end of the temperature probe is connected to the microcontroller 15.

[0074] The closed-loop machining process achieves precise control of the machining process through real-time detection and feedback adjustment, can promptly discover and resolve problems during machining, ensure stable and reliable module quality, and solve the problems of the existing technology in the machining process lacking real-time monitoring and feedback adjustment, making it difficult to ensure machining accuracy. Compared with the existing technology, it greatly improves the degree of machining automation and the consistency of product quality.

[0075] The nano-silica abrasive in the finishing fluid can effectively perform fine grinding and polishing on the surface of the electronic connector molding module 12; the polyethylene glycol dispersant makes the abrasive evenly dispersed in the finishing fluid, ensuring the uniformity of the finishing effect;

[0076] Benzotriazole rust inhibitor prevents the module from rusting during the repair process and protects the surface quality of the module;

[0077] Deionized water is used as a solvent to provide a stable finishing environment;

[0078] The temperature controller and temperature probe in the dressing box 4 monitor the dressing fluid temperature in real time and feed the data back to the microcontroller 15. The microcontroller 15 controls the dressing fluid according to the temperature data to ensure that the dressing fluid works at an appropriate temperature, thereby improving the dressing efficiency and quality.

[0079] This dressing fluid formula and temperature control design solves the problems in the existing technology of poor grinding effect, poor stability and inability to control the dressing temperature affecting the processing quality of the dressing fluid. Compared with the existing technology, it can polish and trim the modules more efficiently, and improve the smoothness and precision of the module surface.

[0080] The three-axis positioning system 11 includes a three-axis acceleration sensor, an inertial measurement unit and a data processing module integrated on the clamping frame 10;

[0081] The triaxial acceleration sensor is fixed at the geometric center of the clamping frame 10. Its X, Y, and Z sensitive axes completely coincide with the triaxial coordinate system of the clamping frame 10, and is used to detect the linear acceleration data of the clamping frame 10 in three orthogonal directions in real time.

[0082] The inertial measurement unit is integrated with a three-axis acceleration sensor, including a gyroscope and a magnetometer;

[0083] The data processing module is electrically connected to the three-axis acceleration sensor and the inertial measurement unit, and has a built-in quaternion-based extended Kalman filter algorithm for fusing acceleration, angular velocity, and magnetic field data to calculate the three-dimensional spatial position coordinates and attitude angle of the clamping frame 10;

[0084] The microcontroller 15 on the injection molding frame 2 receives the position and angle data of the clamping frame 10 output by the data processing module, and sets the parameters for the six-degree-of-freedom robotic arm 3 to clamp the electronic connector molding module 12 .

[0085] The working principle and use process of the present invention:

[0086] First, after the electronic connector is molded by the injection molding machine 1, the industrial CCD camera on the injection molding frame 2 captures images of the molded module, obtains data such as its dimensional deviation, edge burr parameters and surface gloss, and feeds it back to the microcontroller 15;

[0087] The microcontroller 15 dynamically adjusts the working parameters of the servo motor 14 of the motion generating component according to the comparison between the preset standard and the detection data, thereby providing a precise control basis for the subsequent compound motion.

[0088] Subsequently, the servo motor 14 starts and drives the driving inner shaft 316 to rotate, driving the driving rotary sleeve 307 to rotate. The first toothless ring gear 309 and the second toothless ring gear 310 on the driving rotary sleeve 307 periodically mesh with the full-tooth gear 311 of the follower rotary sleeve 308, causing the follower rotary sleeve 308 to produce periodic variable speed rotation.

[0089] The follower rotary sleeve 308 drives the vertical screw 304 to rotate through the first transmission toothed belt, driving the double-acting frame 301 on the end effector frame 315 to perform up and down reciprocating motion;

[0090] At the same time, the follower rotary sleeve 308 drives the synchronous shaft 313 through the elastic transmission toothed belt 314, and is orthogonally transmitted to the horizontal screw 306 through the first bevel gear, driving the double-moving frame 301 to synchronously perform left and right reciprocating motion. The stroke and frequency of the double-moving frame 301 change with the variable speed rotation cycle of the follower rotary sleeve 308;

[0091] In addition, the follower rotary sleeve 308 drives the alternating shaft 302 to rotate alternately forward and reverse through the elastic transmission toothed belt 314, thereby providing rotational power for subsequent compound motion.

[0092] When the alternating shaft 302 rotates, the hinge seat 5 at its bottom end rotates synchronously, and the upper gear ring 6 on the hinge seat 5 engages with the swing bevel gear of the swing frame 8 through the tooth segment, driving the swing frame 8 to swing back and forth within a 45° range;

[0093] At the same time, the lower ring gear 7 on the hinge seat 5 is driven by the third bevel gear, the sleeve shaft 82 and the second bevel gear, so that the reversing shaft 17 rotates alternately forward and reverse. When the reversing shaft 17 rotates, the bevel gear ring 83 on it engages with the rocking bevel gear 85 of the clamping frame 10 through the tooth portion, driving the clamping frame 10 to rock back and forth within the range of ±45°.

[0094] At this point, the clamping frame 10 simultaneously realizes the up-and-down, left-and-right reciprocating motion of the double-moving frame 301, the forward and reverse rotation of the alternating shaft 302, the swing of the swing frame 8, and its own shaking, driving the clamped electronic connector molding module 12 to form a composite three-dimensional dynamic trajectory of "dynamic spiral, tilt, and micro-area coverage" in the dressing fluid of the dressing box 4, completing surface polishing and edge burr trimming;

[0095] During this process, the three-axis positioning system 11 on the clamping frame 10 detects the acceleration, angular velocity and other data of the clamping frame 10 in real time. The data processing module calculates the three-dimensional position and attitude angle of the clamping frame 10 through the extended Kalman filter algorithm. The microcontroller 15 dynamically adjusts the parameters of the servo motor 14 based on the primary detection data to ensure motion accuracy.

[0096] At the same time, the temperature controller in the trimming box 4 monitors the trimming fluid temperature through the temperature probe and feeds back to the microcontroller 15 to maintain the appropriate temperature and improve the trimming efficiency;

[0097] After the trimming is completed, the hot air blower 13 dries the module, and the industrial CCD camera collects the module parameters again and compares them with the initial data;

[0098] If the parameters are qualified, the processing is completed. If they are out of tolerance, an alarm is triggered and the servo motor 14 parameters are readjusted, and the drive module enters the trimming process again, forming a closed-loop control of "detection, adjustment, processing, and re-detection", and ultimately achieving high-precision and high-consistency processing of the electronic connector molding module 12.

[0099] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0100] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An injection molding fixture for producing precision electronic connectors, comprising an injection molding machine (1), an injection molding frame (2) connected to the injection molding machine (1), a six-degree-of-freedom robot arm (3) mounted on the injection molding frame (2), and a trimming box (4), characterized in that: A six-degree-of-freedom robotic arm (3) is provided with a motion generating component driven by a servo motor (14), the motion generating component is connected with a double-motion frame (301) that can synchronously move up and down and left and right and an alternating shaft (302) that can alternately rotate forward and reverse, the reciprocating stroke and reciprocating frequency of the double-motion frame (301) cyclically change, the alternating shaft (302) is rotatably mounted on the double-motion frame (301), a hinge seat (5) is provided at the bottom end of the alternating shaft (302), an upper gear ring (6) and a lower gear ring (7) are respectively provided on the hinge seat (5), and a gear driven by the upper gear ring (6) and capable of rotating. A swing frame (8) that swings back and forth within 45°, a reversing shaft (17) that can rotate alternately forward and reverse is rotatably sleeved on the swing frame (8), a shaft seat (9) is installed at the bottom end of the swing frame (8), a clamping frame (10) that can swing back and forth within ±45° is rotatably installed on the shaft seat (9), a three-axis positioning system (11) and an electric clamping member (16) for clamping the electronic connector molding module (12) are provided on the clamping frame (10), a finishing liquid for finishing and polishing the electronic connector molding module (12) is provided in the finishing box (4), and a detection element (18) and a hot air blower (13) are provided on the injection molding frame (2); The motion generating component comprises an end effector frame (315) driven by a six-degree-of-freedom manipulator (3), a single-action frame (303), a vertical lead screw (304) rotatably connected to the end effector frame (315), a follower inner shaft (305), a horizontal lead screw (306) rotatably connected to the single-action frame (303), a driving rotary sleeve (307), and a follower rotary sleeve (308); the servo motor (14) is mounted on the end effector frame (315); an output shaft end of the servo motor (14) is mounted with a driving inner shaft (316); the driving rotary sleeve (307) is driven by the driving inner shaft (316); the follower rotary sleeve (308) is driven by the follower inner shaft (305); a first toothless gear ring (309) and a second toothless gear ring (310) are mounted on the driving rotary sleeve (307); and a toothless gear ring (310) corresponding to the first toothless gear ring is mounted on the driving rotary sleeve (307). Two symmetrically arranged meshing interruption areas are provided between the ring (309) and the second toothless gear ring (310); two full-tooth gears (311) are installed on the follower rotary sleeve (308); the two full-tooth gears (311) are respectively meshed with the first toothless gear ring (309) and the second toothless gear ring (310); the horizontal lead screw (306) is transmission-connected with the double-moving frame (301); the vertical lead screw (304), the horizontal lead screw (306) and the alternating shaft (302) are all driven by the follower rotary sleeve (308); the rotation connection between the vertical lead screw (304) and the end execution frame (315), the rotation connection between the horizontal lead screw (306) and the single-moving frame (303), the rotation connection between the alternating shaft (302) and the double-moving frame (301), and the rotation connection between the clamping frame (10) and the shaft seat (9) are all provided with a first helical torsion spring (312); The driving rotary sleeve (307) is fixedly provided with a main shaft groove with two ends penetrating therethrough and slidably connected to the driving inner shaft (316), and the following rotary sleeve (308) is fixedly provided with a secondary shaft groove with two ends penetrating therethrough and slidably connected to the following inner shaft (305). The cross sections of the main shaft groove, the secondary shaft groove, the driving inner shaft (316) and the following inner shaft (305) are all regular polygonal structures. A first transmission toothed belt is provided for transmission connection between the following inner shaft (305) and the vertical lead screw (304). The single moving frame (3 03) is rotatably mounted with a synchronization shaft (313), the synchronization shaft (313) and the horizontal lead screw (306) are both mounted with first bevel gears, the two first bevel gears are orthogonally meshed, an elastic transmission toothed belt (314) is transmission-mounted on the follower rotary sleeve (308), the synchronization shaft (313), the follower rotary sleeve (308) and the alternating shaft (302) are all transmission-connected with the elastic transmission toothed belt (314), and the elastic transmission toothed belt (314) is made of elastic rubber and can be elastically stretched.

2. The injection molding fixture for producing precision electronic connectors according to claim 1, characterized in that: The radii of the first toothless gear ring (309) and the second toothless gear ring (310) and the radii of the two full-tooth gears (311) are all the same; the radius of the first toothless gear ring (309) is 11 to 14 times the radius of the full-tooth gear (311); the center angle corresponding to the effective meshing section of the first toothless gear ring (309) is 195°; the center angle corresponding to the effective meshing section of the second toothless gear ring (310) is 105°; and the center angles corresponding to the two meshing interruption zones are both 30°.

3. The injection molding fixture for producing precision electronic connectors according to claim 1, characterized in that: Both sides of the swing frame (8) are equipped with a swing shaft (81), a sleeve shaft (82) is rotatably sleeved on one of the swing shafts (81), the other swing shaft (81) and the sleeve shaft (82) are both rotatably connected to the hinge seat (5), and a swing bevel gear is installed on the swing shaft (81), a group of toothed segments and a group of toothless segments are provided on the upper gear ring (6), and the group of toothed segments and the group of toothless segments are alternately arranged on the upper gear ring (6), and the toothed segments are uniformly provided with first teeth meshing with the swing bevel gear, a second bevel gear is installed on the sleeve shaft (82) and the reversing shaft (17), and the two second bevel gears are orthogonally meshed, a third bevel gear is installed on the sleeve shaft (82), and the third bevel gear is transmission-connected to the lower gear ring (7).

4. The injection molding fixture for producing precision electronic connectors according to claim 1, characterized in that: A bevel gear ring (83) is mounted on the reversing shaft (17), and a rocking bevel gear (85) is mounted on the clamping frame (10). The bevel gear ring (83) is provided with a tooth portion, and the tooth portion is uniformly provided with second teeth meshing with the bevel gear ring (83). The radius of the bevel gear ring (83) and the rocking bevel gear (85) is the same, and the center angle corresponding to the tooth portion is 45°. A second helical torsion spring (84) is fixedly provided at the rotation connection between the clamping frame (10) and the shaft seat (9).

5. The injection molding fixture for producing precision electronic connectors according to claim 1, characterized in that: The electric clamping member (16) includes a double-headed motor integrated in the clamping frame (10), and the two output shaft ends of the double-headed motor are both equipped with clamping screws, and the two clamping screws are both transmission-connected to clamps, and the two clamps are both slidably connected to the clamping frame (10).

6. The injection molding fixture for producing precision electronic connectors according to claim 1, characterized in that: A microcontroller (15) is installed on the injection molding frame (2), and the detection element (18) is an industrial CCD camera; the detection element (18) obtains the size, edge burr parameters and glossiness parameters of the injection molding module during the first visual inspection and feeds them back to the microcontroller (15), and the microcontroller (15) sets the parameters of the servo motor (14) based on the data feedback, and compares the parameters during the first visual inspection during the second inspection. If the deviation is exceeded, an alarm is triggered and re-trim is performed.

7. The injection molding fixture for producing precision electronic connectors according to claim 1, characterized in that: The dressing fluid comprises 5%-10% by mass of nano-silica abrasive, 3%-5% of polyethylene glycol dispersant, 1%-2% of benzotriazole rust inhibitor and the balance of deionized water. The particle size of the nano-silica abrasive is 50nm-100nm. The dressing box (4) is equipped with a temperature controller and a temperature probe. The data end of the temperature probe is connected to the microcontroller (15).

8. The injection molding fixture for producing precision electronic connectors according to claim 1, characterized in that: The three-axis positioning system (11) comprises a three-axis acceleration sensor, an inertial measurement unit, and a data processing module integrated on the clamping frame (10); The three-axis acceleration sensor is fixed to the geometric center of the clamping frame (10), and its X, Y, and Z sensitive axes are completely coincident with the three-axis coordinate system of the clamping frame (10), and is used for real-time detection of linear acceleration data of the clamping frame (10) in three orthogonal directions; The inertial measurement unit is integrated with a three-axis acceleration sensor and includes a gyroscope and a magnetometer; The data processing module is electrically connected to the three-axis acceleration sensor and the inertial measurement unit, and has a built-in extended Kalman filter algorithm based on quaternion, which is used to fuse acceleration, angular velocity and magnetic field data to calculate the three-dimensional spatial position coordinates and attitude angle of the clamping frame (10); The microcontroller (15) on the injection molding frame (2) receives the position and angle data of the clamping frame (10) output by the data processing module, and sets the parameters when the six-degree-of-freedom mechanical arm (3) clamps the electronic connector molding module (12).

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