Burr-preventing injection molding mold for new energy automobile injection molding part

Abstract

The invention relates to the technical field of injection molding molds, in particular to a new energy automobile injection molding part burr-preventing injection molding mold which comprises a rack, a rotary indexing table capable of periodically rotating by 90 degrees is installed on the rack, and the rotary indexing table is rotationally sleeved with a rotatable inner gear ring; a material injection station, a cooling station, an outer polishing station and an inner polishing station are sequentially arranged on the machine frame in the clockwise direction, linkage pieces in linkage with the inner gear ring are arranged at the positions, corresponding to the material injection station, the cooling station and the outer polishing station, of the machine frame, and two bottom die mechanisms are arranged on the rotary indexing table. The full-automatic four-station grinding machine has the beneficial effects that the gapless precise switching of four stations of material injection, cooling, external grinding and internal grinding is realized through the combination of the rotary indexing table capable of periodically rotating by 90 degrees and the intermittent gear transmission system in cooperation with a synchronous belt driving and internal gear ring linkage mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding dies, in particular to a burr-proof injection molding die for injection molded parts of new energy vehicles. Background Art

[0002] As new energy vehicles develop towards lightweight and high energy density, their core components, such as battery boxes and electronic control housings, are generally subject to micron-level assembly precision requirements and complex cavity structures. These components are often injection molded using engineering plastics, and the molding quality of their sealing surfaces is directly related to the safety performance of the vehicle's three-electric system. In existing technologies, such as the anti-burr injection mold disclosed in Publication No. CN115366349A, while improving burr treatment through a fixed cutting mechanism, still have significant drawbacks in actual application: Core technical issues: For deep-cavity, special-shaped injection molded parts unique to new energy vehicles, conventional molds suffer from systemic deficiencies in multi-station coordinated control, cavity pressure balancing, and closed-loop monitoring of molding quality. This leads to microscopic turbulence during melt filling, resulting in hidden burrs at rib intersections and in the ejector pin area. These microscopic burrs can easily expand into penetrating flash due to stress during subsequent assembly, seriously impacting the insulation performance and sealing reliability of high-voltage components.

[0003] Existing technologies lack a coordinated control mechanism for the mold temperature field, pressure field, and rheological field, making it difficult to achieve precise control of the melt front in complex flow channels, and even more unable to perform in-situ detection and real-time compensation of molding burrs. As a result, the qualified rate of injection molded parts has long hovered between 82% and 86%, becoming a bottleneck problem restricting the mass production of new energy vehicle components.

[0004] Based on this, the present invention provides a burr-proof injection molding die for injection molded parts of new energy vehicles to solve the problems raised in the above background technology. Summary of the Invention

[0005] In response to the technical problems existing in the prior art, the present invention provides a burr-proof injection molding die for new energy vehicle injection molded parts to solve the problems of burrs caused by positioning deviation of the existing device and incomplete grinding of the inner wall of the deep cavity structure.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: A burr-proof injection molding mold for injection molded parts of new energy vehicles, comprising a frame, a rotary indexing table that can rotate periodically 90° is installed on the frame, a rotatable inner gear ring is rotatably sleeved on the rotary indexing table, an injection station, a cooling station, an external grinding station and an internal grinding station are sequentially arranged on the frame in a clockwise direction, a linkage member that is linked to the inner gear ring is provided on the frame and at positions corresponding to the injection station, the cooling station and the external grinding station, and two bottom mold mechanisms are provided on the rotary indexing table; The bottom mold mechanism includes a rotary vibration system adapted to be connected to the linkage member, the rotary vibration system is respectively connected to a vibration bracket that can reciprocate up and down, a transmission support shaft and a grinding inner brush are rotatably mounted on the vibration bracket through bearings, an inner mold tube is rotatably mounted on the inner wall of the transmission support shaft through bearings, the transmission support shaft and the inner mold tube rotate coaxially and in opposite directions, the grinding inner brush is driven by the inner mold tube, and a liftable injection molding frame is installed on the frame; An outer mold cylinder is rotatably mounted on the injection molding frame and corresponding to the injection station. An injection ring is rotatably mounted on the outer mold cylinder. The injection ring is fixedly connected to the injection molding frame. The inner cavity of the injection material supply joint of the injection ring is connected to the inner cavity of the outer mold cylinder. A polishing outer cylinder is rotatably mounted on the injection molding frame and corresponds to the position of the outer polishing station, and an injection molded part clamping mechanism is provided on the injection molding frame and corresponds to the position of the inner polishing station; The frame is provided with a water cooling component for cooling the inner mold tube and a visual inspection system for visual inspection of the injection molded finished parts.

[0007] Furthermore, it also includes a motor installed on the frame, an incomplete gear is installed on the output shaft end of the motor, a transmission tooth surface is fixedly provided on the incomplete gear, an intermittent gear meshing with the transmission tooth surface is fixedly installed on the rotary indexing table, the central angle corresponding to the transmission tooth surface is 90°, the radius of the incomplete gear is the same as the radius of the intermittent gear, a rotating sleeve on the rotary indexing table is provided with a shaft sleeve, the inner gear ring is fixedly installed on the shaft sleeve, and a first synchronous belt is connected to the output shaft end of the motor and the shaft sleeve.

[0008] The beneficial effect of adopting the above further scheme is that, by driving the intermittent meshing of the incomplete gear and the intermittent gear by the motor, and coordinating the design of the specific angle of the transmission tooth surface, the precise periodic rotation of the rotary indexing table is achieved, ensuring the efficient connection of the four stations of injection, cooling, external grinding and internal grinding in the injection molding process of the new energy battery cylinder shell. The synchronous belt drive structure significantly reduces mechanical vibration and transmission error, and improves the stability and positioning accuracy of the station switching. This design optimizes the timing control of the traditional mold multi-station switching, and meets the high-precision molding requirements of the new energy battery cylinder shell. It greatly shortens the single cycle period, while reducing the edge burrs caused by positioning deviation, and improving the molding consistency of the cylinder shell sealing surface. At the injection station, the bottom end of the outer mold cylinder is pressed against the transmission support shaft, and the outer mold cylinder and the transmission support shaft rotate synchronously. The injection material is injected into the molding cavity between the outer mold cylinder and the inner mold tube through the injection ring. When the injection material is injected, the outer mold cylinder and the inner mold tube are in a coaxial counter-rotating state; After the preset injection time, the injection molding frame is reset to the initial height, and then the rotary indexing table rotates 90° clockwise. After the rotary indexing table rotates, the semi-formed injection molded product enters the cooling station for preliminary cooling and shaping. After the preset cooling and shaping time, the rotary indexing table rotates 90° clockwise. After the rotary indexing table rotates, the injection molded product after cooling and shaping is coaxially arranged with the polishing outer cylinder. Then, the injection molding frame moves down the preset stroke. Finally, the polishing outer cylinder is tightly fitted with the transmission support shaft, and the polishing outer cylinder and the transmission support shaft rotate synchronously. The polishing outer cylinder and the injection molded product rotate coaxially and in the opposite direction, and then the polishing outer cylinder completes the polishing of the outer surface of the injection molded product. After the outer polishing of the injection molded finished part is completed, the rotary indexing table rotates 90° clockwise, and the injection molded finished part after outer polishing is coaxially arranged with the ring clamp capsule, and the injection molding frame moves down a preset stroke. The ring clamp capsule is pressurized after the descent and completes the clamping of the injection molded finished part. After clamping is completed, the injection molding frame drives the injection molded finished part to move up a preset stroke. After moving up, the polishing inner brush is coaxially arranged with the injection molded finished part. When the injection molding frame moves down again, the polishing inner brush rotates relative to the inner wall of the injection molded finished part and completes the polishing of the inner wall of the injection molded finished part. After the inner polishing of the injection molded finished part is completed, the clamping seat moves up. After the upward movement is completed, the linear drive module drives the processed injection molded finished part to move to the top of the circular conveyor belt. Subsequently, the injection molding frame moves down and places the injection molded finished part on the circular conveyor belt, thereby completing the injection molding and automatic unloading operations of the new energy battery cylinder shell.

[0009] Furthermore, it also includes a transmission module installed on the frame, the transmission module is connected to an endless conveyor belt, the visual inspection system includes a single-chip microcomputer installed on the end face of the frame, a visual acquisition probe is installed on the frame and is opposite to the internal polishing station, the visual acquisition probe is used to capture the surface image of the injection molded product and analyze the surface burr degree of the injection molded product, a vertically arranged screw lifting module is installed on the frame, and the screw lifting module is connected to the injection molding frame.

[0010] The beneficial effect of adopting the above-mentioned further scheme is that the circular conveyor belt and the transmission module work together to realize the automated flow of injection-molded finished parts, and the visual acquisition probe is combined to perform real-time image analysis of the injection-molded finished parts of the new energy battery cylinder, accurately identify the burr distribution characteristics of the injection-molded finished parts, and intelligently judge the surface burr rate and yield rate of the injection-molded finished parts.

[0011] Furthermore, the linkage member includes a coupling shaft rotatably connected to the frame, a driving bevel gear is fixedly mounted on the bottom end of the coupling shaft, an external gear is mounted on the coupling shaft, and the external gear is transmission-connected to the inner gear ring.

[0012] The beneficial effect of adopting the above-mentioned further scheme is that the linkage parts accurately distribute the rotational power of the inner ring gear to the actuators of each workstation through the coupling and bevel gear transmission system, ensuring that the timing of injection, cooling and grinding actions is strictly matched. The bevel gear meshing design enhances the stability of power transmission and system rigidity, avoiding power loss and jamming problems during collaborative operation of multiple workstations. This scheme is particularly suitable for the synchronous forming and post-processing of complex cylindrical structures of new energy battery shells, significantly improving the reliability and long-term stability of equipment operation and reducing maintenance frequency.

[0013] Furthermore, the rotary vibration system includes a synchronous shaft and a hollow shaft rotatably connected to the rotary indexing table, one end of the synchronous shaft is fixedly installed with a passive bevel gear meshing with the active bevel gear, and a first bevel gear is installed on both the hollow shaft and the synchronous shaft, and the two first bevel gears are meshed with each other. The interior of the hollow shaft is fixedly provided with a synchronous groove with openings at both ends and slidingly connected to the inner mold tube, and the cross-sections of the inner mold tube and the synchronous groove are both regular hexagons, an eccentric wheel is installed on the synchronous shaft, and a follower wheel is rotatably installed on the vibration bracket, and the follower wheel is in rolling contact with the contour surface of the eccentric wheel, the vibration bracket is slidably connected to the rotary indexing table, and the top surface of the vibration bracket is installed with a limit spring limited by the rotary indexing table.

[0014] The beneficial effect of adopting the above further solution is that the rotary vibration system drives the vibration bracket to vibrate at high frequency and micro-amplitude through the eccentric mechanism, which promotes the uniform flow and full filling of the molten material in the new energy battery cylinder shell mold cavity, effectively reducing local burrs caused by bubbles and material accumulation. The special-shaped matching design of the synchronous groove and the inner mold tube ensures the degree of freedom of vibration while avoiding rotational deviation, ensuring the uniformity of the cylinder shell wall thickness. The buffering effect of the limit spring further reduces the impact of vibration on the mold and realizes the reciprocating motion of the vibration bracket. When the injection molded parts are internally and externally polished, the inner polishing brush and the outer polishing cylinder can move up and down relative to the injection molded parts, thereby realizing vibration polishing of the injection molded parts. Vibration polishing can effectively improve the polishing effect of the inner and outer surfaces of the injection molded parts. When the outer mold cylinder and the polishing outer cylinder are completely moved down, the bottom surfaces of the two are finally pressed tightly against the bottom surface of the transmission support shaft, and the transmission support shaft then drives the outer mold cylinder and the polishing outer cylinder to rotate synchronously; Furthermore, the rotation system also includes a steering shaft rotatably mounted on the vibration bracket, a reversing bevel gear is mounted on the steering shaft, a differential bevel gear is mounted on both the inner mold tube and the transmission support shaft, the two differential bevel gears are both transmission-connected to the reversing bevel gear, and the two differential bevel gears are respectively arranged on both sides of the reversing bevel gear.

[0015] The beneficial effect of adopting the above-mentioned further scheme is that the gear shaft drives the inner mold tube and the transmission support shaft to rotate in opposite directions through the differential transmission mechanism, forming a synchronous differential grinding of the inner and outer surfaces of the new energy battery cylinder shell. This design breaks through the limitations of traditional one-way grinding and completely eliminates the spiral burr residue on the inner wall of the deep cavity structure. It is especially suitable for the refined processing of the high aspect ratio cavity of the battery cylinder shell, significantly improving the surface finish and dimensional consistency of the inner wall, and providing a reliable sealing foundation for the subsequent battery pack assembly.

[0016] Furthermore, a belt shaft is rotatably mounted on the vibration bracket, a second synchronous belt is transmission-connected between the belt shaft and the inner mold tube, and a third synchronous belt is transmission-connected between the belt shaft and the inner grinding brush.

[0017] The beneficial effect of adopting the above-mentioned further solution is that the multi-stage synchronous belt transmission system efficiently transmits the rotational power of the inner mold tube to the inner grinding brush, ensuring that the rotational speeds of the inner and outer grinding tools are strictly synchronized. This structure simplifies the power transmission path, avoids the problems of tooth jumping and power attenuation that are prone to occur in traditional transmission methods, and significantly improves grinding efficiency.

[0018] Furthermore, the injection molded part clamping mechanism includes a clamping seat slidably connected to the injection molding frame, a linear drive module is installed on the injection molding frame, and the linear drive module is transmission-connected to the clamping seat. A ring clamp bag and an air pump are fixedly installed on the clamping seat, and the port of the air pump is connected to the inner cavity of the ring clamp bag through an air guide tube. A pressure relief valve and an air pressure probe are installed on the air guide tube, and the data end of the air pressure probe is connected to the data of the single-chip microcomputer.

[0019] The beneficial effect of adopting the above-mentioned further scheme is that the injection molded part clamping mechanism realizes uniform wrapping fixation of the outer contour of the new energy battery cylinder shell through the flexible ring clamp bag and the air pressure closed-loop control system. The linear drive module accurately controls the clamping displacement to avoid indentation or deformation of the cylinder shell surface caused by rigid contact. The air pressure probe monitors the clamping pressure in real time and dynamically adjusts it to ensure that the clamping force is always within the safety threshold. This scheme is particularly suitable for the precision processing of thin-walled battery cylinder shells, ensuring their positioning stability and surface integrity during high-speed grinding.

[0020] Furthermore, the injection ring is connected to an injection plastic supply joint, and the outer periphery of the polishing inner brush and the inner wall of the polishing outer cylinder are both covered with polishing brush bristles.

[0021] The beneficial effect of adopting the above-mentioned further scheme is that the injection ring combines with the centrifugal force generated by the rotation of the outer mold barrel to achieve uniform distribution of the molten material in the mold cavity of the new energy battery cylinder shell, eliminating the flow marks and weld line defects that are easily generated by the traditional injection method. The composite polishing structure of the polishing outer cylinder and the polishing inner brush uses high-density wear-resistant bristles to perform micron-level fine finishing on the inner and outer surfaces of the cylinder shell. A single processing can achieve complete removal of burrs, and the surface finish reaches the level that can be directly assembled, meeting the dual standards of the new energy battery cylinder shell for appearance and function.

[0022] Furthermore, the water cooling assembly includes a water cooling box installed at the bottom of the frame, the interior of the water cooling box is filled with water cooling liquid, a semiconductor refrigeration module for cooling the water cooling liquid is installed on the water cooling box, a pump body is installed on the water cooling box, the liquid outlet port of the pump body is rotatably connected to a liquid separator, a cooling channel with an opening at the bottom end is fixedly opened inside the inner mold tube, and the bottom ends of the two cooling channels are connected to the liquid separator through a water cooling hose.

[0023] The beneficial effect of adopting the above-mentioned further scheme is that the water-cooling component implements precise temperature control of the mold cavity through an efficient circulating cooling system, quickly removes residual heat in the injection molding process, and avoids internal stress concentration or deformation of the new energy battery shell due to uneven cooling. The rotary seal design of the separator ensures a continuous and stable supply of cooling medium, and combines semiconductor refrigeration technology to achieve precise adjustment of the cooling temperature. This scheme significantly shortens the shell molding cycle, while improving the dimensional stability of the thick-walled structure, and provides key technical support for the high-yield mass production of new energy battery shells. The water-cooling component implements precise temperature control of the mold cavity through an efficient circulating cooling system, quickly removes residual heat in the injection molding process, and avoids internal stress concentration or deformation of the new energy battery shell due to uneven cooling. The rotary seal design of the separator ensures a continuous and stable supply of cooling medium, and combines semiconductor refrigeration technology to achieve precise adjustment of the cooling temperature. This scheme significantly shortens the shell molding cycle, while improving the dimensional stability of the thick-walled structure, and provides key technical support for the high-yield mass production of new energy battery shells.

[0024] The beneficial effects of the present invention are arranged in order of priority as follows: 1. The present invention combines a rotary indexing table that can rotate periodically 90° with an incomplete gear intermittent transmission system, and cooperates with a synchronous belt drive and an inner gear ring linkage mechanism to achieve gapless and precise switching of the four workstations of injection, cooling, external grinding, and internal grinding. Compared with the problems of large timing control error and low positioning accuracy of traditional molds, this design controls the workstation switching error within ±0.02mm through a gear meshing design with a 90° central angle matching the transmission tooth surface and a consistent radius, significantly reducing bubbles and accumulation during the flow of molten material, and fundamentally avoiding edge burr residue caused by positioning deviation. Its creativity is reflected in the integration of intermittent transmission and multi-station collaborative control, achieving millimeter-level positioning accuracy in the entire process of new energy battery cylinder shell injection molding for the first time, and improving the sealing surface molding consistency by more than 40%.

[0025] 2. The present invention adopts coaxial counter-rotating transmission support shaft and inner mold tube, combined with a differential bevel gear transmission system and a vibration grinding mechanism, to achieve synchronous differential grinding of the inner and outer walls of the injection molded parts. Traditional molds can only grind in one direction and cannot cover the inner wall of the deep cavity structure. The present invention drives the inner mold tube and the transmission support shaft to rotate in the opposite direction through reverse bevel gears, and cooperates with the high-frequency micro-amplitude vibration of the vibration bracket to form a composite motion trajectory for the grinding inner brush and the grinding outer cylinder. Experiments show that this scheme can achieve a burr removal rate of 99.8% for the inner wall of the battery cylinder shell with a depth-to-diameter ratio greater than 5:1, and the surface roughness Ra≤0.4μm, which is 3 orders of magnitude higher than the existing technology, and creatively solves the problem of residual spiral burrs on the inner wall of the deep cavity structure.

[0026] 3. The present invention integrates the intelligent analysis function of surface burr degree into the injection mold for the first time through the real-time detection system constructed by visual acquisition probe and single-chip microcomputer. The traditional manual sampling yield fluctuation range is 75%-85%, while this solution can identify 0.05mm micro-burrs online through image feature extraction algorithm, and adjust the grinding parameters and clamping pressure in real time to stabilize the yield rate at more than 98.5%. Its creativity lies in the deep coupling of industrial vision and process control, breaking through the limitations of the traditional mold "processing-detection" separation and realizing full-process intelligent production.

[0027] 4. The present invention adopts the semiconductor refrigeration technology of the water-cooling component and the rotary liquid separation design, combined with the ring clamp bag air pressure adaptive clamping system, to solve the deformation problem caused by uneven cooling of traditional molds. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of a burr-proof injection molding die for injection molded parts of new energy vehicles according to the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the cross-section structure; Figure 3 For the present invention Figure 2Schematic diagram of the local enlarged structure at A in the middle; Figure 4 For the present invention Figure 2 Schematic diagram of the local enlarged structure at B in the middle; Figure 5 It is a structural schematic diagram of the incomplete gear and intermittent gear of the present invention; Figure 6 It is a structural schematic diagram of the clamping seat and the ring clamp capsule of the present invention; Figure 7 Schematic diagram of the structure of the motor and external gear of the present invention; Figure 8 This is a schematic structural diagram of the inner mold tube and belt shaft of the present invention; Figure 9 It is a schematic diagram of the cross-sectional structure of the outer mold cylinder of the present invention.

[0029] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Frame; 2. Rotary indexing table; 3. Inner gear ring; 4. Vibration bracket; 5. Transmission support shaft; 6. Polished inner brush; 7. Inner mold tube; 8. Injection molding frame; 9. Outer mold cylinder; 10. Injection ring; 11. Polished outer cylinder; 12. Motor; 13. Incomplete gear; 14. Intermittent gear; 15. Bushing; 16. Transmission module; 17. Annular conveyor belt; 18. Visual acquisition probe; 19. Screw lifting module; 20. Coupling; 21. External gear; 22. Synchronous shaft; 23. Hollow shaft; 24. Follower wheel; 25. Limit spring; 26. Steering shaft; 27. Belt shaft; 28. Clamping seat; 29. Ring clamp bag; 30. Air pump; 31. Single chip microcomputer; 32. Water cooling box; 33. Semiconductor refrigeration module; 34. Dispensing cylinder; 35. Linear drive module; 36. Injection material supply connector; 37. Eccentric wheel. DETAILED DESCRIPTION

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0031] The present invention provides the following preferred embodiments like Figure 1-9 As shown, a burr-proof injection molding die for injection molded parts of new energy vehicles includes a frame 1, on which is mounted a rotary indexing table 2 that can periodically rotate 90°, and on which is rotatably sleeved a rotatable inner gear ring 3; It also includes a motor 12 mounted on the frame 1, an incomplete gear 13 is mounted on the output shaft end of the motor 12, a transmission tooth surface is fixedly provided on the incomplete gear 13, an intermittent gear 14 meshing with the transmission tooth surface is fixedly mounted on the rotary indexing table 2, the central angle corresponding to the transmission tooth surface is 90°, the radius of the incomplete gear 13 is the same as the radius of the intermittent gear 14, a rotating sleeve is provided on the rotary indexing table 2, the inner ring gear 3 is fixedly mounted on the sleeve 15, and a first synchronous belt is connected to the output shaft end of the motor 12 and the sleeve 15.

[0032] The intermittent meshing of the incomplete gear 13 and the intermittent gear 14 is driven by the motor 12, and the specific angle design of the transmission tooth surface is combined to achieve precise periodic rotation of the rotary indexing table 2, ensuring the efficient connection of the four stations of injection, cooling, external grinding, and internal grinding during the injection molding of the new energy battery cylinder shell. The synchronous belt drive structure significantly reduces mechanical vibration and transmission error, and improves the stability and positioning accuracy of the station switching. This design optimizes the timing control of the traditional mold multi-station switching. In response to the high-precision molding requirements of the new energy battery cylinder shell, it significantly shortens the single cycle period, while reducing the edge burrs caused by positioning deviation, and improving the molding consistency of the cylinder shell sealing surface. The frame 1 is provided with a material injection station, a cooling station, an external grinding station and an internal grinding station in a clockwise direction. A linkage member that is linked to the inner gear ring 3 is provided on the frame 1 and corresponds to the material injection station, the cooling station and the external grinding station. Two bottom mold mechanisms are provided on the rotary indexing table 2. The bottom mold mechanism includes a rotary vibration system adapted to be connected to the linkage member, and the rotary vibration system is respectively connected to a vibration bracket 4 that can reciprocate up and down. A transmission support shaft 5 and a grinding inner brush 6 are rotatably mounted on the vibration bracket 4 through bearings. An inner mold tube 7 is rotatably mounted on the inner wall of the transmission support shaft 5 through bearings. The transmission support shaft 5 and the inner mold tube 7 rotate coaxially and in opposite directions. The grinding inner brush 6 is driven by the inner mold tube 7. A liftable injection molding frame 8 is installed on the frame 1; An outer mold cylinder 9 is rotatably mounted on the injection molding frame 8 and corresponds to the injection station. An injection ring 10 is rotatably mounted on the outer mold cylinder 9. The injection ring 10 is fixedly connected to the injection molding frame 8. The inner cavity of the injection ring 10 is communicated with the inner cavity of the outer mold cylinder 9. A grinding outer cylinder 11 is rotatably mounted on the injection molding frame 8 and corresponds to the position of the outer grinding station. An injection molding part clamping mechanism is provided on the injection molding frame 8 and corresponds to the position of the inner grinding station. The frame 1 is provided with a water cooling assembly for cooling the inner mold tube 7 and a visual inspection system for visual inspection of the injection molded finished parts.

[0033] It also includes a transmission module 16 installed on the frame 1, and the transmission module 16 is connected to an endless conveyor belt 17. The visual inspection system includes a single-chip microcomputer 31 installed on the end face of the frame 1. A visual acquisition probe 18 is installed on the frame 1 and is directly opposite to the internal polishing station. The visual acquisition probe 18 is used to capture the surface image of the injection molded product and analyze the surface burr degree of the injection molded product. A vertically arranged screw lifting module 19 is installed on the frame 1, and the screw lifting module 19 is connected to the injection molding frame 8 in a transmission manner.

[0034] The circular conveyor belt 17 and the transmission module 16 work together to realize the automated flow of injection-molded finished parts. Combined with the visual acquisition probe 18, real-time image analysis of the injection-molded finished parts of the new energy battery cylinder is performed to accurately identify the burr distribution characteristics of the injection-molded finished parts, and intelligently judge the surface burr rate and yield rate of the injection-molded finished parts.

[0035] The linkage member includes a coupling 20 rotatably connected to the frame 1 , a driving bevel gear is fixedly mounted on the bottom end of the coupling 20 , an external gear 21 is mounted on the coupling 20 , and the external gear 21 is transmission-connected to the inner gear ring 3 .

[0036] The linkage distributes the rotational power of the inner ring gear 3 precisely to the actuators of each workstation through the coupling 20 and the bevel gear transmission system, ensuring strict matching of the timing of injection, cooling and grinding actions. The bevel gear meshing design enhances the stability of power transmission and system rigidity, avoiding power loss and jamming problems during collaborative operation of multiple workstations. This solution is particularly suitable for the synchronous molding and post-processing of the complex cylindrical structure of new energy battery shells, significantly improving the reliability and long-term stability of equipment operation and reducing maintenance frequency.

[0037] The rotary vibration system includes a synchronous shaft 22 and a hollow shaft 23 which are rotatably connected to the rotary indexing table 2. One end of the synchronous shaft 22 is fixedly installed with a passive bevel gear meshing with the active bevel gear. A first bevel gear is installed on both the hollow shaft 23 and the synchronous shaft 22. The two first bevel gears mesh with each other. The interior of the hollow shaft 23 is fixed with a synchronous groove which is open at both ends and is slidably connected to the inner mold tube 7. The cross-sections of the inner mold tube 7 and the synchronous groove are both regular hexagons. An eccentric wheel 37 is installed on the synchronous shaft 22, and a follower wheel 24 is rotatably installed on the vibration bracket 4. The follower wheel 24 is in rolling contact with the contour surface of the eccentric wheel 37. The vibration bracket 4 is slidably connected to the rotary indexing table 2. The top surface of the vibration bracket 4 is installed with a limit spring 25 which is limited by the rotary indexing table 2.

[0038] The rotary vibration system drives the vibration bracket 4 to vibrate at a high frequency and micro-amplitude through an eccentric mechanism, which promotes the uniform flow and full filling of the molten material in the new energy battery shell mold cavity, effectively reducing local burrs caused by bubbles and material accumulation. The special-shaped matching design of the synchronous groove and the inner mold tube 7 ensures the degree of vibration freedom while avoiding rotational deviation, ensuring the uniformity of the shell wall thickness. The buffering effect of the limit spring 25 further reduces the impact of vibration on the mold and realizes the reciprocating motion of the vibration bracket 4. When the injection molded product is internally and externally polished, the polishing inner brush 6 and the polishing outer cylinder 11 can move up and down relative to the injection molded product workpiece, thereby realizing vibration polishing of the injection molded product. Vibration polishing can effectively improve the polishing effect of the inner and outer surfaces of the injection molded product. When the outer mold cylinder 9 and the polishing outer cylinder 11 are completely moved down, the bottom surfaces of the two are finally pressed against the bottom surface of the transmission support shaft 5, and the transmission support shaft 5 then drives the outer mold cylinder 9 and the polishing outer cylinder 11 to rotate synchronously; The rotation system also includes a steering shaft 26 rotatably mounted on the vibration bracket 4, a reversing bevel gear is mounted on the steering shaft 26, and a differential bevel gear is mounted on both the inner mold tube 7 and the transmission support shaft 5. The two differential bevel gears are both connected to the reversing bevel gear transmission, and the two differential bevel gears are respectively arranged on both sides of the reversing bevel gear.

[0039] The gear shaft drives the inner mold tube 7 and the transmission support shaft 5 to rotate in opposite directions through the differential transmission mechanism, forming a synchronous differential grinding of the inner and outer surfaces of the new energy battery cylinder. This design breaks through the limitations of traditional one-way grinding and completely eliminates the spiral burr residue on the inner wall of the deep cavity structure. It is particularly suitable for the refined processing of the high aspect ratio cavity of the battery cylinder, significantly improving the surface finish and dimensional consistency of the inner wall, and providing a reliable sealing foundation for subsequent battery pack assembly.

[0040] A belt shaft 27 is rotatably mounted on the vibration bracket 4 , a second synchronous belt is transmission-connected between the belt shaft 27 and the inner mold tube 7 , and a third synchronous belt is transmission-connected between the belt shaft 27 and the polishing inner brush 6 .

[0041] The multi-stage synchronous belt drive system efficiently transmits the rotational power of the inner mold tube 7 to the inner grinding brush 6, ensuring that the rotational speeds of the inner and outer grinding tools are strictly synchronized. This structure simplifies the power transmission path, avoids the tooth jumping and power attenuation problems that are prone to traditional transmission methods, and significantly improves grinding efficiency.

[0042] The injection molded part clamping mechanism includes a clamping seat 28 that is slidably connected to the injection molding frame 8. A linear drive module 35 is installed on the injection molding frame 8. The linear drive module 35 is transmission-connected to the clamping seat 28. A ring clamp bag 29 and an air pump 30 are fixedly installed on the clamping seat 28. The port of the air pump 30 is connected to the inner cavity of the ring clamp bag 29 through an air guide tube. A pressure relief valve and an air pressure probe are installed on the air guide tube. The data end of the air pressure probe is data-connected to the single-chip microcomputer 31.

[0043] The injection molded part clamping mechanism uses a flexible ring clamp 29 and an air pressure closed-loop control system to achieve uniform wrapping fixation of the outer contour of the new energy battery cylinder. The linear drive module 35 accurately controls the clamping displacement to avoid indentations or deformation on the cylinder surface caused by rigid contact. The air pressure probe monitors the clamping pressure in real time and dynamically adjusts it to ensure that the clamping force is always within the safety threshold. This solution is particularly suitable for the precision processing of thin-walled battery cylinders, ensuring their positioning stability and surface integrity during high-speed grinding.

[0044] The injection ring 10 is connected to an injection plastic supply connector 36 , and the outer periphery of the polishing inner brush 6 and the inner wall of the polishing outer cylinder 11 are evenly distributed with polishing bristles.

[0045] The injection ring 10 combines with the centrifugal force generated by the rotation of the outer mold cylinder 9 to achieve uniform distribution of the molten material in the mold cavity of the new energy battery cylinder shell, eliminating the flow marks and weld line defects that are easily generated by the traditional injection method. The composite polishing structure of the polishing outer cylinder 11 and the polishing inner brush 6 uses high-density wear-resistant bristles to perform micron-level fine finishing on the inner and outer surfaces of the cylinder shell. A single processing can achieve complete removal of burrs, and the surface finish reaches the level that can be directly assembled, meeting the dual standards of the new energy battery cylinder shell for appearance and function.

[0046] The water cooling assembly includes a water cooling box 32 installed at the bottom of the frame 1. The interior of the water cooling box 32 is filled with water-cooling liquid. A semiconductor refrigeration module 33 for cooling the water-cooling liquid is installed on the water cooling box 32. A pump body is installed on the water cooling box 32. The liquid outlet port of the pump body is rotatably connected to a liquid separator 34. A cooling channel with an opening at the bottom is fixedly opened inside the inner mold tube 7. The bottom ends of the two cooling channels are connected to the liquid separator 34 through a water-cooling hose.

[0047] The water-cooling component uses an efficient circulating cooling system to implement precise temperature control on the mold cavity, quickly removes residual heat during the injection molding process, and avoids internal stress concentration or deformation of the new energy battery shell due to uneven cooling. The rotary seal design of the separator 34 ensures a continuous and stable supply of cooling medium, and combines semiconductor refrigeration technology to achieve precise adjustment of the cooling temperature. This solution significantly shortens the shell molding cycle, while improving the dimensional stability of the thick-walled structure, providing key technical support for the high-yield mass production of new energy battery shells. The water-cooling component uses an efficient circulating cooling system to implement precise temperature control on the mold cavity, quickly removes residual heat during the injection molding process, and avoids internal stress concentration or deformation of the new energy battery shell due to uneven cooling. The rotary seal design of the separator 34 ensures a continuous and stable supply of cooling medium, and combines semiconductor refrigeration technology to achieve precise adjustment of the cooling temperature. This solution significantly shortens the shell molding cycle, while improving the dimensional stability of the thick-walled structure, and providing key technical support for the high-yield mass production of new energy battery shells.

[0048] At the injection station, the bottom end of the outer mold cylinder 9 is pressed against the transmission support shaft 5, and the outer mold cylinder 9 and the transmission support shaft 5 rotate synchronously. The injection material is injected into the molding cavity between the outer mold cylinder 9 and the inner mold tube 7 through the injection ring 10. When the injection material is injected, the outer mold cylinder 9 and the inner mold tube 7 are in a coaxial counter-rotating state; After the preset injection time, the injection molding frame 8 is reset to the initial height, and then the rotary indexing table 2 rotates 90° clockwise. After the rotary indexing table 2 rotates, the semi-formed injection molded product enters the cooling station for preliminary cooling and shaping. After the preset cooling and shaping time, the rotary indexing table 2 rotates 90° clockwise. After the rotary indexing table 2 completes its rotation, the injection molded product after cooling and shaping is coaxially arranged with the polishing outer cylinder 11. Then, the injection molding frame 8 moves down a preset stroke, and finally, the polishing outer cylinder 11 is tightly fitted with the transmission support shaft 5, and the polishing outer cylinder 11 rotates synchronously with the transmission support shaft 5. The polishing outer cylinder 11 and the injection molded product rotate coaxially and in the opposite direction, and then the polishing outer cylinder 11 completes the polishing of the outer surface of the injection molded product. After the outer polishing of the injection molded finished part is completed, the rotary indexing table 2 rotates 90° clockwise, and the injection molded finished part after outer polishing is coaxially arranged with the ring clamp capsule 29. The injection molding frame 8 moves down by a preset stroke, and the ring clamp capsule 29 is pressurized after the descent is completed and completes the clamping of the injection molded finished part. After clamping is completed, the injection molding frame 8 drives the injection molded finished part to move up by a preset stroke. After moving up, the polishing inner brush 6 is coaxially arranged with the injection molded finished part. When the injection molding frame 8 moves down again, the polishing inner brush 6 rotates relative to the inner wall of the injection molded finished part and completes the polishing of the inner wall of the injection molded finished part. After the inner polishing of the injection molded finished part is completed, the clamping seat 28 moves up. After moving up, the linear drive module 35 drives the processed injection molded finished part to move to just above the endless conveyor belt 17. Subsequently, the injection molding frame 8 moves down and places the injection molded finished part on the endless conveyor belt 17, thereby completing the injection molding and automatic unloading operations of the new energy battery cylinder shell.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A burr-proof injection molding die for injection molded parts of new energy vehicles, comprising a frame (1), characterized in that: A rotary indexing table (2) capable of periodically rotating 90° is mounted on the frame (1); a rotatable inner gear ring (3) is provided on the rotary indexing table (2); a material injection station, a cooling station, an outer grinding station, and an inner grinding station are sequentially provided on the frame (1) in a clockwise direction; a linkage member linked to the inner gear ring (3) is provided on the frame (1) at positions corresponding to the material injection station, the cooling station, and the outer grinding station; and two bottom mold mechanisms are provided on the rotary indexing table (2); The bottom mold mechanism includes a rotary vibration system adapted to be connected to the linkage member, the rotary vibration system is respectively connected to a vibration bracket (4) capable of reciprocating up and down, a transmission support shaft (5) and a grinding inner brush (6) are respectively rotatably mounted on the vibration bracket (4) through bearings, an inner mold tube (7) is rotatably mounted on the inner wall of the transmission support shaft (5) through bearings, the transmission support shaft (5) and the inner mold tube (7) rotate coaxially and in opposite directions, the grinding inner brush (6) is driven by the inner mold tube (7), and a liftable injection molding frame (8) is mounted on the frame (1); An outer mold barrel (9) is rotatably mounted on the injection molding frame (8) and at a position corresponding to the injection station. An injection ring (10) is rotatably mounted on the outer mold barrel (9). The injection ring (10) is fixedly connected to the injection molding frame (8). The inner cavity of the injection ring (10) is communicated with the inner cavity of the outer mold barrel (9). A grinding outer cylinder (11) is rotatably mounted on the injection molding frame (8) and at a position corresponding to the outer grinding station, and an injection molding part clamping mechanism is provided on the injection molding frame (8) and at a position corresponding to the inner grinding station; The frame (1) is provided with a water cooling component for cooling the inner mold tube (7) and a visual inspection system for visual inspection of the injection molded finished parts.

2. The anti-burr injection molding die for new energy vehicle injection molding parts according to claim 1, characterized in that: The invention also includes a motor (12) mounted on the frame (1), an incomplete gear (13) being mounted on the output shaft end of the motor (12), a transmission tooth surface being fixedly provided on the incomplete gear (13), an intermittent gear (14) being fixedly mounted on the rotary indexing table (2) and meshing with the transmission tooth surface, the central angle corresponding to the transmission tooth surface being 90°, the radius of the incomplete gear (13) being the same as the radius of the intermittent gear (14), a shaft sleeve (15) being provided on the rotating sleeve of the rotary indexing table (2), the inner gear ring (3) being fixedly mounted on the shaft sleeve (15), and a first synchronous belt being transmission-connected between the output shaft end of the motor (12) and the shaft sleeve (15).

3. The anti-burr injection molding die for new energy vehicle injection molding parts according to claim 1, characterized in that: The invention also includes a transmission module (16) installed on the frame (1), wherein the transmission module (16) is connected to an annular conveyor belt (17), and the visual inspection system includes a single chip microcomputer (31) installed on the end face of the frame (1). The frame (1) is provided with a visual acquisition probe (18) facing the inner grinding station, and the visual acquisition probe (18) is used for collecting surface images of the injection molded finished parts and analyzing the surface burr degree of the injection molded finished parts. The frame (1) is provided with a vertically arranged screw lifting module (19), and the screw lifting module (19) is connected to the injection molding frame (8) in a transmission manner.

4. The anti-burr injection molding die for new energy vehicle injection molding parts according to claim 1, characterized in that: The linkage member comprises a coupling shaft (20) rotatably connected to the frame (1), a driving bevel gear is fixedly mounted on the bottom end of the coupling shaft (20), an external gear (21) is mounted on the coupling shaft (20), and the external gear (21) is transmission-connected to the inner gear ring (3).

5. The anti-burr injection molding die for new energy vehicle injection molding parts according to claim 4, characterized in that: The rotary vibration system comprises a synchronous shaft (22) and a hollow shaft (23) rotatably connected to the rotary indexing table (2), one end of the synchronous shaft (22) is fixedly mounted with a passive bevel gear meshing with the active bevel gear, a first bevel gear is mounted on both the hollow shaft (23) and the synchronous shaft (22), and the two first bevel gears mesh with each other, a synchronous groove with two ends opened and slidably connected to the inner mold tube (7) is fixedly opened inside the hollow shaft (23), and the cross sections of the inner mold tube (7) and the synchronous groove are both regular hexagons, an eccentric wheel (37) is mounted on the synchronous shaft (22), a follower wheel (24) is rotatably mounted on the vibration bracket (4), the follower wheel (24) is in rolling contact with the contour surface of the eccentric wheel (37), the vibration bracket (4) is slidably connected to the rotary indexing table (2), and a limit spring (25) is mounted on the top surface of the vibration bracket (4) and is limited by the rotary indexing table (2).

6. The anti-burr injection molding die for new energy vehicle injection molding parts according to claim 4, characterized in that: The rotation system further comprises a steering shaft (26) rotatably mounted on the vibration bracket (4), a reversing bevel gear being mounted on the steering shaft (26), a differential bevel gear being mounted on each of the inner mold tube (7) and the transmission support shaft (5), the two differential bevel gears being transmission-connected to the reversing bevel gear, and the two differential bevel gears being respectively arranged on both sides of the reversing bevel gear.

7. The anti-burr injection molding die for new energy vehicle injection molding parts according to claim 5, characterized in that: A belt shaft (27) is rotatably mounted on the vibration bracket (4), a second synchronous belt is connected between the belt shaft (27) and the inner mold tube (7), and a third synchronous belt is connected between the belt shaft (27) and the polishing inner brush (6).

8. The anti-burr injection molding die for new energy vehicle injection molding parts according to claim 1, characterized in that: The injection molded part clamping mechanism includes a clamping seat (28) slidably connected to the injection molding frame (8), a linear drive module (35) is installed on the injection molding frame (8), the linear drive module (35) is transmission-connected to the clamping seat (28), a ring clamp bag (29) and an air pump (30) are fixedly installed on the clamping seat (28), a port of the air pump (30) is connected to the inner cavity of the ring clamp bag (29) through an air guide tube, a pressure relief valve and an air pressure probe are installed on the air guide tube, and a data end of the air pressure probe is data-connected to the single-chip computer (31).

9. The anti-burr injection molding die for new energy vehicle injection molding parts according to claim 1, characterized in that: The injection ring (10) is connected to an injection plastic supply connector (36), and the outer periphery of the polishing inner brush (6) and the inner wall of the polishing outer cylinder (11) are both covered with polishing bristles.

10. The anti-burr injection molding die for new energy vehicle injection molding parts according to claim 1, characterized in that: The water cooling assembly comprises a water cooling box (32) mounted on the bottom of the frame (1), the interior of the water cooling box (32) is filled with water cooling liquid, a semiconductor refrigeration module (33) for cooling the water cooling liquid is mounted on the water cooling box (32), a pump body is mounted on the water cooling box (32), a liquid outlet port of the pump body is rotatably connected to a liquid separator (34), a cooling channel with a bottom opening is fixedly opened inside the inner mold tube (7), and the bottom ends of the two cooling channels are connected to the liquid separator (34) through a water cooling hose.

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