Injection molding clamp for precise electronic connector production

Abstract

The invention relates to the technical field of injection molding fixtures, and discloses an injection molding fixture for precise electronic connector production, which comprises an injection molding machine, an injection molding frame connected with the injection molding machine, a six-degree-of-freedom mechanical arm and a finishing box, the six-degree-of-freedom mechanical arm and the finishing box are mounted on the injection molding frame, and a motion generation part driven by a servo motor is mounted on the six-degree-of-freedom mechanical arm; a double-acting frame capable of synchronously moving up and down and left and right in a reciprocating mode and an alternating shaft capable of alternately rotating forwards and backwards are connected to the motion generating component, the reciprocating stroke and the reciprocating frequency of the double-acting frame change circularly, the alternating shaft is rotationally installed on the double-acting frame, and a hinged support is installed at the bottom end of the alternating shaft. A composite three-dimensional dynamic track of'dynamic spiral, inclination and micro-area coverage 'is innovatively achieved, the module moves in multiple dimensions in the finishing liquid through the composite three-dimensional dynamic track, traditional blind areas such as the edge of the module and the curved surface of the module are completely covered, the polishing efficiency is improved, the burr residual rate is reduced, and the polishing quality is improved. And the surface precision of the precise electronic connector injection molding module is obviously improved.

Description

Technical Field

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

[0002] As one of the core components of electronic devices, the molding quality of precision electronic connectors directly affects the signal transmission stability and service life of the devices. In the injection molding process of electronic connectors, the injection molding fixture is a key device connecting the injection molding machine and the subsequent trimming process. Its functions not only include the precise clamping of the molded parts, but also the surface polishing and edge burr trimming of the parts through dynamic motion control.

[0003] In the prior art, the patent document with the publication number CN116811160A discloses a blanking fixture for an injection molding machine, which realizes the blanking operation of plastic barrels through a base, a fixed shaft, a connecting sleeve and a clamping member, and improves the blanking efficiency to a certain extent. However, with the continuous improvement of the requirements for surface accuracy, edge burrs and complex curved surface processing of precision electronic connectors, the following key problems have gradually emerged in the existing fixture technology: The prior art is not convenient to synchronously complete the trimming operation of the parts during the blanking of precision electronic connector parts. Although there have been some trimming devices using trimming fluid on the market, the existing trimming devices have a single motion trajectory, incomplete trimming coverage, and lack of a closed-loop detection and dynamic adjustment mechanism during trimming; Based on this, the present invention provides an injection molding fixture for the production of precision electronic connectors to solve the technical problems proposed in the above background art. Summary of the Invention

[0004] In order to overcome the deficiencies of the prior art, 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-region coverage". Through the composite three-dimensional dynamic trajectory, the parts move in multiple dimensions in the trimming fluid, thoroughly covering traditional blind areas such as the edges and surfaces of the parts, improving the polishing efficiency and reducing the burr residue rate, and significantly improving the surface accuracy of the injection molded parts of precision electronic connectors.

[0005] To achieve the above object, 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. A motion generating component driven by a servo motor is mounted on the six-degree-of-freedom robotic arm. A double-acting frame capable of synchronously moving up and down and reciprocating left and right, and an alternating shaft capable of alternately rotating forward and backward are connected to the motion generating component. The reciprocating stroke and reciprocating frequency of the double-acting frame change cyclically. The alternating shaft is rotatably mounted on the double-acting frame. A hinge seat is mounted at the bottom end of the alternating shaft. An upper tooth ring and a lower tooth ring are respectively mounted on the hinge seat. A swing frame driven by the upper tooth ring and capable of reciprocatingly swinging within 45° is provided on the hinge seat. A reversing shaft capable of alternately rotating forward and backward is rotatably sleeved on the swing frame. A shaft seat is mounted at the bottom end of the swing frame. A clamping frame capable of reciprocatingly rocking within ±45° is rotatably mounted on the shaft seat. A three-axis positioning system and an electric clamping member for clamping the electronic connector molding part are provided on the clamping frame. A trimming liquid for trimming and polishing the electronic connector molding part is provided in the trimming box. A detection element and a hot air blower are provided on the injection molding frame; After the injection molding of the electronic connector, the servo motor working parameters of the motion generating component are obtained by one-time visual inspection of the molding part through the detection element and fed back for adjustment. The motion generating component drives the double-acting frame to work, so that the electronic connector molding part forms a composite three-dimensional dynamic trajectory of "dynamic spiral, inclination, and micro-area coverage" in the trimming liquid to complete polishing and edge trimming. After trimming and polishing, it is dried by hot air and subjected to secondary visual inspection to form a closed-loop processing flow.

[0006] 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-acting frame, a vertical lead screw rotatably connected to the end effector frame, a follower inner shaft, a horizontal lead screw rotatably connected to the single-acting frame, a driving swivel and a follower swivel. The servo motor is mounted on the end effector frame. A driving inner shaft is mounted at the output shaft end of the servo motor. The driving swivel is driven by the driving inner shaft. The follower swivel is driven by the follower inner shaft. A first toothless gear ring and a second toothless gear ring are respectively mounted on the driving swivel. Two symmetrically arranged engagement interruption zones are provided on the driving swivel at positions corresponding to the first toothless gear ring and the second toothless gear ring. Two full-tooth gears are mounted on the follower swivel. 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 in transmission connection with the double-acting frame. The vertical lead screw, the horizontal lead screw, and the alternating shaft are all driven by the follower swivel. First spiral torsion springs are provided at the rotational connection of the vertical lead screw and the end effector frame, the rotational connection of the horizontal lead screw and the single-acting frame, the rotational connection of the alternating shaft and the double-acting frame, and the rotational connection of the clamping frame and the shaft seat.

[0007] 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°.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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.

[0012] As a preferred technical solution of the present invention, a microcontroller is installed on the injection molding rack, the detection element is an industrial CCD camera, and when the detection element performs a visual inspection once, it acquires the size, edge burr parameters and glossiness parameters of the injection molded part and feeds them back to the microcontroller. The microcontroller sets the servo motor parameters according to the data feedback. During the secondary inspection, the parameters during the first visual inspection are compared. If there is an out-of-tolerance situation, an alarm is triggered and re-trimming is performed.

[0013] As a preferred technical solution of the present invention, the trimming liquid 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. A temperature controller and a temperature probe are built into the trimming box, and the data terminal of the temperature probe is connected to the data of the microcontroller.

[0014] 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 integrally arranged on the clamping frame; 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 are used to detect the linear acceleration data of the clamping frame in three orthogonal directions in real time; The inertial measurement unit is integrally arranged with the 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 is built-in with an extended Kalman filter algorithm based on quaternions, which is used to fuse acceleration, angular velocity and magnetic field data, and calculate the three-dimensional spatial position coordinates and attitude angles of the clamping frame; The microcontroller on the injection molding rack receives the clamping frame position and angle data output by the data processing module, and sets the parameters when the six-degree-of-freedom robotic arm clamps the electronic connector molding part.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In the prior art, the trimming devices of traditional injection molding jigs generally have problems of single movement trajectory and incomplete coverage. They can only achieve linear or uniform rotation motion, resulting in difficult full contact between the trimming liquid and areas such as the edges of the molded parts and complex curved surfaces. The polishing effect is uneven and the burr residue rate is high. Through the linkage design of the motion generating components, the present invention innovatively realizes a composite three-dimensional dynamic trajectory of "dynamic spiral, tilting, and micro-area coverage". Through the composite three-dimensional dynamic trajectory, the molded part moves in multiple dimensions in the trimming liquid, thoroughly covering traditional blind areas such as the edges and curved surfaces of the molded part, improving the polishing efficiency and reducing the burr residue rate, and significantly improving the surface accuracy of precision electronic connector injection molded parts.

[0016] 2. In the prior art, the fixture trimming process lacks a real-time detection and feedback mechanism and relies only on preset parameters for processing, making it unable to cope with individual differences in modules or equipment errors, resulting in poor processing consistency and a high rejection rate. Through the cooperation of an industrial CCD camera and a microcontroller, the present invention constructs a closed-loop processing flow: primary detection: after injection molding, parameters such as the size, burrs, and glossiness of the module are obtained in real time and fed back to the microcontroller to dynamically adjust the operating parameters of the servo motor; secondary detection: after trimming and drying, detection is carried out again, and the initial parameters are compared. If there is an out-of-tolerance situation, an alarm is triggered and re-trimming is performed. This mechanism enables processing errors to be traceable and parameters to be self-adaptive, improving product consistency and reducing the rejection rate, and significantly enhancing production efficiency and the yield rate of good products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an injection molding fixture for producing a precision electronic connector according to the present invention; Figure 2 For the present invention Figure 1 is a schematic structural diagram from another perspective; Figure 3 is a schematic structural diagram of a six-degree-of-freedom robotic arm and a servo motor according to the present invention; Figure 4 is a schematic structural diagram of a servo motor and an upper gear ring according to the present invention; Figure 5 For the present invention Figure 4 is a schematic diagram of a partially enlarged structure at A in the present invention; Figure 6 is a schematic structural diagram of a follower swivel and a driving swivel according to the present invention; Figure 7 is a schematic structural diagram of a first spiral torsion spring and a lower gear ring according to the present invention; Figure 8 is a schematic cross-sectional structural diagram of a hinge seat and an alternating shaft according to the present invention; Figure 9 For the present invention Figure 8 is a schematic diagram of a partially enlarged structure at B in the present invention.

[0018] 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 toothed ring; 7, lower toothed ring; 8, swing frame; 9, shaft seat; 10, clamping frame; 11, three-axis positioning system; 12, electronic connector forming module; 13, hot air blower; 14, servo motor; 15, microcontroller; 16, electric clamping part; 17, reversing shaft; 18, detection element; 301, double moving frame; 302, alternating shaft; 303, single moving frame; 304, vertical lead screw; 305, follower inner shaft; 306, horizontal lead screw; 307, driving swivel; 308, follower swivel; 309, first toothless toothed ring; 310, second toothless toothed ring; 311, full-tooth gear; 312, first helical torsion spring; 313, synchronizing shaft; 314, elastic transmission toothed belt; 315, end effector frame; 316, driving inner shaft; 81, swing shaft; 82, sleeve shaft; 83, bevel toothed ring; 84, second helical torsion spring; 85, rocking bevel gear. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] As Figures 1 to 9 shown, the present invention provides an injection molding fixture for the production of precision electronic connectors, including 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; The injection molding machine 1 is used for the injection molding process of the electronic connector forming module 12; A motion generating component driven by a servo motor 14 is installed on the six-degree-of-freedom robotic arm 3. A double moving frame 301 that can synchronously move up and down and left and right reciprocally and an alternating shaft 302 that can alternately rotate forward and backward are connected to the motion generating component. The reciprocating stroke and reciprocating frequency of the double moving frame 301 change cyclically, and the alternating shaft 302 is rotatably installed on the double moving frame 301; The motion generating component includes an end effector frame 315 driven by the six-degree-of-freedom robotic arm 3, a single moving 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 moving frame 303, a driving swivel 307, and a follower swivel 308; The servo motor 14 is installed on the end effector frame 315. A driving inner shaft 316 is installed at the output shaft end of the servo motor 14. The driving swivel 307 is driven by the driving inner shaft 316, and the follower swivel 308 is driven by the follower inner shaft 305; The inside of the driving rotating sleeve 307 is fixedly provided with a main shaft groove that penetrates through both ends and is slidably connected to the driving inner shaft 316. The inside of the follower rotating sleeve 308 is fixedly provided with a secondary shaft groove that penetrates through both ends and is slidably connected to the follower inner shaft 305. The cross-sections of the main shaft groove, the secondary shaft groove, the driving inner shaft 316, and the follower inner shaft 305 are all regular polygon structures; A first missing-tooth gear ring 309 and a second missing-tooth gear ring 310 are respectively installed on the driving rotating sleeve 307. At the positions corresponding to the first missing-tooth gear ring 309 and the second missing-tooth gear ring 310 on the driving rotating sleeve 307, there are two symmetrically arranged meshing interruption areas; Two full-tooth gears 311 are installed on the follower rotating sleeve 308. The two full-tooth gears 311 are respectively meshed and connected to the first missing-tooth gear ring 309 and the second missing-tooth gear ring 310; The radii of the first missing-tooth gear ring 309 and the second missing-tooth gear ring 310 are the same as the radii of the two full-tooth gears 311. The radius of the first missing-tooth gear ring 309 is 11 times the radius of the full-tooth gear 311. The central angle corresponding to the effective meshing section of the first missing-tooth gear ring 309 is 195°. The central angle corresponding to the effective meshing section of the second missing-tooth gear ring 310 is 105°. The central angles corresponding to the two meshing interruption areas are both 30°; The horizontal lead screw 306 is in transmission connection with the double-acting frame 301. The vertical lead screw 304, the horizontal lead screw 306, and the alternating shaft 302 are all driven by the follower rotating sleeve 308. At the rotational connection positions of the vertical lead screw 304 and the end effector 315, the horizontal lead screw 306 and the single-acting frame 303, the alternating shaft 302 and the double-acting frame 301, and the clamping frame 10 and the shaft seat 9, first spiral torsion springs 312 are provided; A first transmission belt is in transmission connection between the follower inner shaft 305 and the vertical lead screw 304. A synchronous shaft 313 is rotatably installed on the single-acting frame 303. First bevel gears are installed on both the synchronous shaft 313 and the horizontal lead screw 306. The two first bevel gears are orthogonally meshed. An elastic transmission belt 314 is in transmission installation on the follower rotating sleeve 308. The synchronous shaft 313, the follower rotating sleeve 308, and the alternating shaft 302 are all in transmission connection with the elastic transmission belt 314. The elastic transmission belt 314 is made of elastic rubber material and can be elastically stretched; The driving inner shaft 316 is driven to rotate by the servo motor 14, driving the driving rotating sleeve 307 to rotate. The first missing-tooth gear ring 309 and the second missing-tooth gear ring 310 on the driving rotating sleeve 307 are respectively meshed with the full-tooth gears 311 on the follower rotating sleeve 308. Due to the different central angles of the effective meshing sections of the first missing-tooth gear ring 309 and the second missing-tooth gear ring, the follower rotating sleeve 308 will generate periodic variable-speed rotation.

[0021] The follower rotating sleeve 308 drives the vertical lead screw 304 to rotate through the first transmission belt, causing the end effector 315 to drive the double-acting frame 301 to move up and down; Meanwhile, the follower rotating sleeve 308 drives the synchronous shaft 313 through the elastic transmission toothed belt 314. Through the first bevel gear transmission, the horizontal lead screw 306 rotates to drive the double moving frame 301 to move left and right, and the reciprocating stroke and frequency of the double moving frame 301 change cyclically.

[0022] The follower rotating sleeve 308 also drives the alternating shaft 302 to rotate forward and reverse alternately through the elastic transmission toothed belt 314, realizing the linkage between the synchronous up-and-down and left-and-right reciprocating movement of the double moving frame 301 and the forward and reverse alternation of the alternating shaft 302, providing a power basis for the subsequent compound movement of the module in the dressing liquid, enabling the module to form a complex movement trajectory, improving the dressing and polishing effect, solving the problems of single movement of the fixture and incomplete dressing and polishing in the prior art. Compared with the prior art, it can more efficiently perform multi-dimensional movement control on the electronic connector forming module 12, improving the machining accuracy and quality. A hinge seat 5 is installed at the bottom end of the alternating shaft 302. An upper toothed ring 6 and a lower toothed ring 7 are respectively installed on the hinge seat 5. A swing frame 8 driven by the upper toothed ring 6 and capable of reciprocating swing within 45° is provided on the hinge seat 5. A reversing shaft 17 capable of rotating forward and reverse alternately 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 capable of reciprocating swing 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 forming module 12 are provided on the clamping frame 10. Swing shafts 81 are installed on both side surfaces of the swing frame 8. A sleeve shaft 82 is rotatably sleeved on one swing shaft 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 this swing shaft 81. A set of toothed segments and a set of toothless segments are arranged on the upper toothed ring 6, and the set of toothed segments and the set of toothless segments are alternately arranged on the upper toothed ring 6. [[ID=⑨]]First teeth meshing with the swing bevel gear are evenly distributed on the toothed segments. Second bevel gears are installed on both 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 in transmission connection with the lower toothed ring 7. A bevel gear ring 83 is installed on the reversing shaft 17. A rocking bevel gear 85 is installed on the clamping frame 10. A tooth portion is provided on the bevel gear ring 83, and second teeth meshing with the bevel gear ring 83 are evenly distributed on the tooth portion. The bevel gear ring 83 and the rocking bevel gear 85 have the same radius, and the central angle corresponding to the tooth portion is 45°. A second spiral torsion spring 84 is fixedly arranged at the rotational connection of the clamping frame 10 and the shaft seat 9. The rotation of the alternating shaft 302 drives the rotation of the hinge seat 5. The upper toothed ring 6 on the hinge seat 5 rotates with the hinge seat 5. The toothed segments of the upper toothed ring 6 mesh with the swing bevel gear, driving the swing shaft 81 to drive the swing frame 8 to reciprocate swing within 45°. Meanwhile, the lower toothed ring 7 on the hinge seat 5 rotates, and through the transmission of the third bevel gear, the sleeve shaft 82 and the second bevel gear, the reversing shaft 17 rotates forward and reverse alternately.

[0023] When the swing frame 8 swings, the reversing shaft 17 drives the bevel gear ring 83 to rotate. The tooth part of the bevel gear ring 83 meshes with the rocking bevel gear 85, driving the clamping frame 10 to reciprocate within ±45°, realizing the linkage between the rocking of the clamping frame 10 and the rotation of the reversing shaft 17; Such a structural design enables the clamped electronic connector forming module 12 to not only move up and down, left and right reciprocally with the double-acting frame 301 and rotate with the alternating shaft 302 in the finishing liquid, but also realize the swing of the swing frame 8 and the rocking of the clamping frame 10, forming a composite three-dimensional dynamic trajectory of "dynamic spiral, inclination, and micro-region coverage", polishing and edge trimming the module in all directions, solving the problems in the prior art that the movement trajectory of the module is single during the trimming process and it is impossible to fully contact the finishing liquid for efficient trimming. Compared with the prior art, the comprehensiveness and fineness of the trimming are greatly improved, ensuring the surface quality of the module; In terms of uniqueness, in the angle ratio of the first toothless gear ring 309, the second toothless gear ring 310 and the full-tooth gear 311, the effective meshing central angle of the first toothless gear ring 309 is 195°, the effective meshing central angle of the second toothless gear ring 310 is 105°, and each non-meshing interruption area is 30°. The sum of 360° forms a complete circular motion cycle; The non-symmetric effective meshing angle of 195°:105° causes the follower swivel sleeve 308 to generate periodic variable-speed rotation, driving the movement stroke and frequency of the double-acting frame 301 to cycle and change. If a symmetric angle or too small an angle difference is adopted, the expected effect cannot be achieved; The 45° reciprocating swing of the swing frame 8 limits the maximum swing amplitude, ensuring that the swing frame 8 does not exceed the constraint range of the hinge seat 5. The ±45° reciprocating rocking of the clamping frame 10 is complementary to the swing angle of the swing frame 8, causing the module to form a dead corner in the composite motion coverage. An angle exceeding 45° may cause mechanical interference, and being too small will not allow for comprehensive trimming.

[0024] In terms of irreplaceability, the angles of the first toothless gear ring 309 and the second toothless gear ring 310 cause the double-acting frame 301 to generate a variable acceleration motion through non-symmetric meshing, forming a "dynamic spiral" trajectory, breaking through the problem of uneven trimming caused by the single uniform motion of traditional fixtures. If the gear rack, cam mechanism or electronic speed control servo motor 14 solution is used instead, there are deficiencies such as complex structure, high cost, and response lag; The angles of the swing frame 8 and the clamping frame 10 cause the module to generate an inclination angle and micro-vibration, solving the problems of edge and complex curved surface trimming in traditional processes. If only a single motion or multi-axis robot control is used, it will lead to a decrease in the comprehensiveness of trimming or high cost and large space occupation; In terms of creativity, a complex motion trajectory is realized through a pure mechanical structure without a high-cost electronic servo system, converting the "angle difference" of gear transmission into the "dimension difference" of the motion trajectory, which is an interdisciplinary innovation in mechanical design; The angle parameter is linked with the vision detection system to form a closed loop of "detection, motion control, and re-detection", realizing the "parameterization of physical structure" and improving the processing flexibility; The compound angle motion causes the module to generate a turbulent effect in the dressing fluid, and combining with temperature-controlled dressing fluid improves the polishing efficiency.

[0025] The electric clamping member 16 includes a double-headed motor integrated in the clamping frame 10. Clamping screws are installed at both output shaft ends of the double-headed motor. Clamps are drivingly connected to both clamping screws, and both clamps are slidably connected to the clamping frame 10; The double-headed motor of the electric clamping member 16 drives the two clamping screws to rotate, driving the clamps to slide on the clamping frame 10, realizing the stable clamping and loosening of the electronic connector forming module 12; This clamping method is convenient to operate and has uniform clamping force. It can be flexibly adjusted according to the size and shape of the module, ensuring that the module remains stable during the complex motion process, avoiding damage to the module or poor dressing effect caused by unstable clamping, solving the problems of poor stability and insufficient adaptability of the clamping device in the prior art. Compared with the prior art, it improves the compatibility of the fixture with different specifications of modules and the stability during the processing; A dressing fluid for dressing and polishing the electronic connector forming module 12 is provided in the dressing box 4, and a detection element 18 and a hot air blower 13 are provided on the injection molding frame 2; After the electronic connector is injection molded, the servo motor 14 of the motion generating component is feedback-adjusted by obtaining the module parameters through the first vision detection of the detection element 18. The motion generating component drives the double-acting frame 301 to work, so that the electronic connector forming module 12 forms a composite three-dimensional dynamic trajectory of "dynamic spiral, tilt, and micro-region coverage" in the dressing fluid to complete polishing and edge trimming. After dressing and polishing, it is dried by hot air and subjected to secondary vision detection, constituting a closed-loop processing flow.

[0026] A microcontroller 15 is installed on the injection molding frame 2. The detection element 18 is an industrial CCD camera. During the first vision detection, the size, edge burr parameters, and glossiness parameters of the injection molded 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 detection, the parameters during the first vision detection are compared. If there is an out-of-tolerance, an alarm is triggered and re-trimmed, and the working parameters of the servo motor 14 are adjusted for the second time.

[0027] 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. A thermostat and a temperature probe are built into the dressing box 4, and the data terminal of the temperature probe is data-connected to the microcontroller 15.

[0028] The closed-loop machining process realizes precise control of the machining process through real-time detection and feedback adjustment, can promptly detect and solve problems in machining, ensures the stable and reliable quality of the module, solves the problems in the prior art of lack of real-time monitoring and feedback adjustment in the machining process and difficulty in ensuring machining accuracy, and greatly improves the automation degree of machining and the consistency of product quality compared with the prior art.

[0029] The nano-silica abrasive in the dressing fluid can effectively carry out fine grinding and polishing on the surface of the electronic connector forming module 12; the polyethylene glycol dispersant makes the abrasive evenly dispersed in the dressing fluid to ensure the uniformity of the dressing effect; The benzotriazole rust inhibitor prevents the module from rusting during the dressing process and protects the surface quality of the module; Deionized water is used as a solvent to provide a stable dressing environment; The temperature controller and temperature probe in the dressing box 4 monitor the temperature of the dressing fluid in real time and feed the data back to the microcontroller 15. The microcontroller 15 makes adjustments according to the temperature data to ensure that the dressing fluid works at an appropriate temperature, improving the dressing efficiency and quality; This dressing fluid formula and temperature control design solve the problems in the prior art of poor grinding effect, poor stability of the dressing fluid, and inability to control the dressing temperature, which affects the machining quality. Compared with the prior art, it can polish and dress the module more efficiently, improving the surface finish and accuracy of the module.

[0030] The three-axis positioning system 11 includes a three-axis acceleration sensor, an inertial measurement unit and a data processing module integrally arranged on the clamping frame 10; The three-axis acceleration sensor is fixed at the geometric center of the clamping frame 10, and its X, Y, and Z sensitive axes completely coincide with the three-axis coordinate system of the clamping frame 10, and are used to detect the linear acceleration data of the clamping frame 10 in three orthogonal directions in real time; The inertial measurement unit is integrally arranged with the 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 is built-in with an extended Kalman filter algorithm based on quaternions, and is used to fuse the acceleration, angular velocity and magnetic field data to calculate the three-dimensional space position coordinates and attitude angles 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 robotic arm 3 clamps the electronic connector forming module 12.

[0031] The working principle and usage process of the present invention: First, after the electronic connector is formed by the injection molding machine 1, the industrial CCD camera on the injection mold 2 collects images of the formed module, obtains data such as its dimensional deviation, edge burr parameters, and surface glossiness, and feeds it back to the microcontroller 15; The microcontroller 15 compares the preset standard with the detection data and dynamically adjusts the working parameters of the servo motor 14 of the motion generating component to provide a precise control basis for subsequent compound motions.

[0032] Subsequently, the servo motor 14 starts and drives the driving inner shaft 316 to rotate, driving the driving rotating sleeve 307 to rotate. The first toothless gear ring 309 and the second toothless gear ring 310 on the driving rotating sleeve 307 are periodically engaged with the full-tooth gear 311 of the follower rotating sleeve 308, causing the follower rotating sleeve 308 to rotate periodically with variable speed; The follower rotating sleeve 308 drives the vertical lead screw 304 to rotate through the first transmission belt, driving the double-acting frame 301 on the end effector 315 to reciprocate up and down; At the same time, the follower rotating sleeve 308 drives the synchronous shaft 313 through the elastic transmission belt 314, and is orthogonally transmitted to the horizontal lead screw 306 through the first bevel gear, driving the double-acting frame 301 to reciprocate left and right synchronously, and the stroke and frequency of the double-acting frame 301 change cyclically with the variable-speed rotation of the follower rotating sleeve 308; In addition, the follower rotating sleeve 308 drives the alternating shaft 302 to rotate forward and backward alternately through the elastic transmission belt 314, providing rotational power for subsequent compound motions.

[0033] When the alternating shaft 302 rotates, the hinge seat 5 at its bottom rotates synchronously. The upper tooth ring 6 on the hinge seat 5 is engaged with the swing bevel gear of the swing frame 8 through the toothed section, driving the swing frame 8 to swing reciprocally within a range of 45°; At the same time, the lower tooth ring 7 on the hinge seat 5 is transmitted through the third bevel gear, the sleeve shaft 82, and the second bevel gear, causing the reversing shaft 17 to rotate forward and backward alternately. When the reversing shaft 17 rotates, the bevel gear ring 83 on it is engaged with the swing bevel gear 85 of the clamping frame 10 through the tooth portion, driving the clamping frame 10 to swing reciprocally within a range of ±45°.

[0034] So far, the clamping frame 10 simultaneously realizes the up and down, left and right reciprocating motions of the double-acting frame 301, the forward and backward rotation of the alternating shaft 302, the swing of the swing frame 8, and its own swing, driving the clamped electronic connector formed module 12 to form a "dynamic spiral, inclined, micro-region covering" composite three-dimensional dynamic trajectory in the finishing liquid of the finishing box 4, completing surface polishing and edge burr trimming; During this process, the three-axis positioning system 11 on the clamping frame 10 real-time detects data such as the acceleration and angular velocity of the clamping frame 10. The data processing module solves 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 in combination with the primary detection data to ensure the motion accuracy; Meanwhile, the thermostat in the trimming box 4 monitors the temperature of the trimming fluid through a temperature probe, and feeds back to the microcontroller 15 to maintain an appropriate temperature, improving the trimming efficiency; After 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; If the parameters are qualified, the processing is completed. If they are out of tolerance, an alarm is triggered and the parameters of the servo motor 14 are readjusted, driving the module to enter the trimming process again, forming a closed-loop control of "detection, adjustment, processing, and re-detection", and finally achieving high-precision and high-consistency processing of the electronic connector forming module 12.

[0035] It should be noted that in this article, relational terms such as first and second are only used 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 "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0036] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection molding fixture for the production of 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) mounted on the injection molding frame (2), and a trimming box (4), characterized in that: A six-degree-of-freedom robotic arm (3) is equipped with a motion generating component driven by a servo motor (14). A double moving frame (301) capable of synchronously moving up and down and left and right reciprocally and an alternating shaft (302) capable of alternately rotating forward and backward are connected to the motion generating component. The reciprocating stroke and reciprocating frequency of the double moving frame (301) change cyclically. The alternating shaft (302) is rotatably installed on the double moving frame (301). A hinge seat (5) is installed at the bottom end of the alternating shaft (302). An upper gear ring (6) and a lower gear ring (7) are respectively installed on the hinge seat (5). A swing frame (8) driven by the upper gear ring (6) and capable of reciprocally swinging within 45° is provided on the hinge seat (5). A reversing shaft (17) capable of alternately rotating forward and backward 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) capable of reciprocally rocking within ±45° is rotatably installed on the shaft seat (9). A three-axis positioning system (11) and an electric clamping member (16) for clamping an electronic connector forming module (12) are provided on the clamping frame (10). A finishing liquid for finishing and polishing the electronic connector forming module (12) is provided in a finishing box (4). A detection element (18) and a hot air blower (13) are provided on an injection molding frame (2).

2. The injection molding fixture for producing a precision electronic connector according to claim 1, wherein: The motion generating component includes an end effector frame (315) driven by a six-degree-of-freedom robotic arm (3), a single moving 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 moving frame (303), a driving swivel (307), and a follower swivel (308). The servo motor (14) is installed on the end effector frame (315). A driving inner shaft (316) is installed at the output shaft end of the servo motor (14). The driving swivel (307) is driven by the driving inner shaft (316). The follower swivel (308) is driven by the follower inner shaft (305). A first toothless gear ring (309) and a second toothless gear ring (310) are respectively installed on the driving swivel (307). Two symmetrically arranged meshing interruption areas are provided on the driving swivel (307) at positions corresponding to between the first toothless gear ring (309) and the second toothless gear ring (310). Two full-tooth gears (311) are installed on the follower swivel (308). The two full-tooth gears (311) are respectively meshed and connected with the first toothless gear ring (309) and the second toothless gear ring (310). 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 the follower swivel (308). First spiral torsion springs (312) are provided at the rotational connection of the vertical lead screw (304) and the end effector frame (315), at the rotational connection of the horizontal lead screw (306) and the single moving frame (303), at the rotational connection of the alternating shaft (302) and the double moving frame (301), and at the rotational connection of the clamping frame (10) and the shaft seat (9).

3. The injection molding fixture for producing a precision electronic connector according to claim 2, wherein: 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°.

4. The injection molding fixture for producing precision electronic connectors according to claim 2, characterized in that: 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.

5. The injection molding fixture for producing a precision electronic connector 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).

6. The injection molding fixture for producing a precision electronic connector according to claim 1, wherein: 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).

7. An injection molding fixture for the production of a precision electronic connector according to claim 1, characterized in that: The electric clamping member (16) includes a double-headed motor integrated within the clamping frame (10). Clamping lead screws are mounted at both output shaft ends of the double-headed motor. Clamps are drivingly connected to both of the clamping lead screws, and both of the clamps are slidably connected to the clamping frame (10).

8. The injection molding fixture for producing a precision electronic connector according to claim 1, wherein: A microcontroller (15) is mounted on the injection molding frame (2), and the detection element (18) is an industrial CCD camera. When the detection element (18) performs a primary visual inspection, it acquires the size, edge burr parameters, and glossiness parameters of the injection molded part and feeds them back to the microcontroller (15). The microcontroller (15) sets the parameters of the servo motor (14) based on the data feedback. During the secondary inspection, it compares the parameters obtained during the primary visual inspection. If there is an out-of-tolerance situation, it triggers an alarm and performs re-trimming.

9. An injection molding fixture for the production of a precision electronic connector according to claim 1, characterized in that: The trimming liquid contains 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. A temperature controller and a temperature probe are built into the trimming box (4), and the data terminal of the temperature probe is data-connected to the microcontroller (15).

10. The injection molding fixture for the production of a precision electronic connector according to claim 1, characterized in that: The three-axis positioning system (11) includes a three-axis acceleration sensor, an inertial measurement unit, and a data processing module that are integrally arranged on the clamping frame (10). The three-axis acceleration sensor is fixed at the geometric center of the clamping frame (10), and its X, Y, and Z sensitive axes completely coincide with the three-axis coordinate system of the clamping frame (10), and are used to detect the linear acceleration data of the clamping frame (10) in three orthogonal directions in real time. The inertial measurement unit is integrally arranged with the 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 incorporates an extended Kalman filter algorithm based on quaternions, and is used to fuse the acceleration, angular velocity, and magnetic field data to calculate the three-dimensional spatial position coordinates and attitude angles 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 robotic arm (3) picks up the electronic connector molding part (12).

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