A multi-cavity threaded injection mold for integrated injection molding of dual-material pick-up heads

Abstract

This invention relates to the technical field of two-color injection molds, and discloses a multi-cavity threaded injection mold for integrated injection molding of dual-material pick-up heads. It includes a sliding base assembly, with a first side base and a second side base above the sliding base assembly. A transmission gear assembly is slidably arranged between the first side base and the second side base. A molded threaded rod assembly is rotatably mounted on the first side base and the second side base. A rack guide plate is fixedly mounted on the outside of the sliding base assembly, and a circuit-controlled mechanical cover plate is fixedly mounted above the first side base and the second side base. This invention achieves stable supply and uniform application of lubricating oil through the synergistic effect of the main oil chamber, auxiliary oil chamber, and oil-absorbing cotton within the transmission gear assembly, combined with the precise control of a metering drain valve. The rolling transmission of the gear groove assembly ensures that the lubricating oil can evenly cover the tooth surface of the driving pinion assembly.

Description

Technical Field

[0001] This invention belongs to the technical field of two-color injection molds, and more specifically, it relates to a multi-cavity threaded injection mold for integrated injection molding of dual-material pick-up heads. Background Technology

[0002] Currently, in the integrated injection molding of dual-material ear picks, multi-cavity threaded injection molds are commonly used to complete the integrated thread forming and automatic demolding. However, existing multi-cavity threaded injection molds still have several technical shortcomings in practical use:

[0003] Firstly, the gear transmission structure of traditional molds operates in a high-frequency reciprocating meshing state for extended periods, lacking a self-adaptive quantitative lubrication and closed-loop oil return structure. Relying solely on manual periodic lubrication, it cannot achieve automatic oil supply synchronized with the demolding action, easily leading to uneven lubrication and localized dry friction due to insufficient oil. Long-term use can easily cause gear tooth surface wear, increased meshing clearance, and consequently, problems such as transmission jamming and increased rotational resistance. Furthermore, existing molds lack a lubricant recovery and circulation structure, allowing excess lubricant to flow freely. This not only easily contaminates the mold cavity and the finished product from the dual-material pick-up lugs, causing product appearance and molding defects, but also wastes lubricant, requiring frequent manual lubrication. The manual oiling and cleaning process is labor-intensive and cannot meet the needs of long-term continuous injection molding production. The wear degree of the gear transmission components corresponding to each cavity in conventional multi-cavity molds varies, and there is a lack of real-time detection of meshing pressure and automatic angle correction mechanism, making it impossible to sense the gear meshing accuracy and positional deviation in real time. When gear wear causes angular deviation, it cannot be automatically fine-tuned and compensated, which can easily cause asynchronous rotation angles of the adjustment screws. This leads to quality problems such as inconsistent thread specifications of the dual material picks in multi-cavity molds, thread misalignment, assembly jamming, and excessive burrs, resulting in a high defect rate and making it difficult to meet the requirements of high-precision and high-consistency mass production.

[0004] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a multi-cavity threaded injection mold for integrated injection molding of dual material pick-up heads, in order to achieve a more practical and valuable purpose. Summary of the Invention

[0005] This invention provides a multi-cavity threaded injection mold for integrated injection molding of dual-material pick-up heads, which overcomes the above-mentioned defects in the prior art.

[0006] The purpose and effect of this invention, a multi-cavity threaded injection mold for integrated injection molding of dual-material pick-up heads, are achieved by the following specific technical means:

[0007] A multi-cavity screw positioning injection mold for integrated injection molding of dual material picker head includes a sliding base assembly. A first side base and a second side base are provided on the upper part of the sliding base assembly. A transmission gear assembly is slidably provided between the first side base and the second side base. A molded screw rod assembly is rotatably installed on the first side base and the second side base.

[0008] A rack guide plate is fixedly installed on the outside of the sliding base assembly. A circuit control mechanical cover plate is fixedly installed above the first side base and the second side base. An active pinion assembly is provided inside the first side base. A circuit board and a control chip are provided inside the circuit control mechanical cover plate.

[0009] The transmission gear assembly is equipped with an oil bladder, a pressure-sensitive diaphragm, and oil-absorbing cotton inside. The movement of the sliding base assembly will drive the active pinion assembly to rotate. The rotation of the active pinion assembly will drive the die screw assembly to rotate synchronously. The pressure-sensitive diaphragm will transmit the meshing accuracy of the active pinion assembly in real time. When the active pinion assembly meshes and squeezes, the oil-absorbing cotton will lubricate it and reduce errors.

[0010] In a further technical solution, the sliding base assembly includes a sliding base, on which a fixed mounting base is fixedly installed, a sliding block is slidably provided below the sliding base, a sliding pin is inserted inside the sliding block, a transmission pin is fixedly connected to the sliding pin, and a sliding limiting groove is provided on the sliding base, and the transmission pin moves inside the sliding limiting groove.

[0011] A further technical solution includes a first side base comprising a base mounting component, a side upright plate assembly on the inner side of the base mounting component, and a circular rotating groove on the base mounting component. A molded threaded rod assembly is fixedly mounted on the second side base. The molded threaded rod assembly includes two sets of quick-release mounting components. Several sets of height adjustment components are arrayed between the two sets of quick-release mounting components. The several sets of height adjustment components correspond to the circular rotating groove. An adjusting threaded rod is provided between the circular rotating groove and the height adjustment components. A transmission pinion is provided on the adjusting threaded rod. A double material picking head is fixedly connected to the end of the adjusting threaded rod.

[0012] In a further technical solution, the transmission gear assembly includes a gear slot assembly, on which a driving pinion assembly is provided. The driving pinion assembly includes a driving shaft, on which a large gear and a driven pinion are provided. The driven pinion is disposed on one side of the first side base, the large gear is disposed on one side of the second side base, and the driven pinion is disposed on the gear slot assembly. The large gear meshes with the transmission pinion and rotates.

[0013] In a further technical solution, the drive shaft is also provided with a fine-tuning gear, which is located on the side away from the driven pinion. Adjustment components are fixedly installed on both sides of the fine-tuning gear. The adjustment components are located at the upper end of the side upright plate assembly. The adjustment components include a cylinder tank, which is located inside the side upright plate assembly. An electric control valve is fixedly connected inside the cylinder tank, and a telescopic adjustment fork is fixedly connected to the upper end of the electric control valve.

[0014] A further technical solution is provided, wherein the transmission gear assembly includes a gear groove assembly, the gear groove assembly is provided with two layers of partitions, the two layers of partitions divide its interior into a main oil chamber, a secondary oil chamber and a return oil collection chamber, valves are provided between the main oil chamber, the secondary oil chamber and the return oil collection chamber, a piston push rod is slidably provided inside the secondary oil chamber, one end of the piston push rod is fixedly connected to a piston, and the other end of the piston push rod is fixedly connected to an external fixing seat, the external fixing seat is fixedly installed on the outside of the first side base and the second side base.

[0015] A further technical solution includes a gear groove assembly comprising a gear groove side baffle, a plurality of gear grooves being provided between the gear groove side baffles, a drain port being provided on the opposite side of two sets of gear groove side baffles, a drain pipe being provided on the outer side of the drain port, the other end of the drain pipe being connected to the inside of the oil return collection chamber, an oil outlet being provided at the bottom of the bottom groove of the drain port, the oil outlet being connected to the inside of the main oil chamber, and a metering drain valve being provided at the connection between the main oil chamber and the oil outlet.

[0016] In a further technical solution, an oil pipe is slidably provided inside the main oil chamber, and a piston is also provided at one end of the oil pipe. An oil bladder box is fixedly connected to the other end of the oil pipe, and the oil bladder box is provided with multiple conduits, which are connected to the cylinder tank.

[0017] In a further technical solution, oil-absorbing cotton is installed inside the groove of the gear groove assembly, and a pressure-sensitive membrane is laid inside the groove of the gear groove assembly. The surface of the pressure-sensitive membrane is provided with multiple pores, and the multiple pores correspond to the oil-absorbing cotton.

[0018] A further technical solution is that the dual-material ear-collecting head includes an annular sleeve, a rigid connecting part is fixedly connected to the outer side of the annular sleeve, and a soft connecting part is fixedly connected above the rigid connecting part; a threaded connecting part is provided on the inner side of the annular sleeve, and the threaded connecting part is threadedly connected to the front end of the adjusting screw rod.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This invention discloses a multi-cavity threaded injection mold for integrated injection molding of dual-material ear picks. Through the synergistic action of the main oil chamber, auxiliary oil chamber, and oil-absorbing cotton within the transmission gear assembly, combined with the precise control of the metering drain valve, a stable supply and uniform application of lubricating oil are achieved. In conjunction with the rolling transmission of the gear groove assembly, the lubricating oil evenly covers the tooth surface of the drive pinion assembly, forming a complete lubrication protective film. This effectively reduces frictional loss between the drive pinion assembly and the gear groove assembly, avoiding problems such as tooth surface wear and jamming. Simultaneously, it prevents lubricating oil leakage that contaminates the mold and product, ensuring the stable operation of the drive pinion assembly, extending the service life of gears, shafts, and other components, ensuring smooth transmission, laying the foundation for subsequent precise transmission, and avoiding potential hazards such as component damage and transmission jamming due to insufficient lubrication.

[0021] This invention relates to a multi-cavity threaded injection mold for integrated injection molding of dual-material ear picks. Building upon the aforementioned beneficial effects, it achieves precise control of the quantitative drain valve, combined with the oil storage and release characteristics of absorbent cotton, to realize the quantitative supply and recycling of lubricating oil. This avoids mold contamination and product molding defects caused by excessive lubricating oil, as well as tooth surface wear caused by insufficient lubricating oil. Furthermore, the closed-loop design of the oil return channel allows for the recycling and reuse of excess lubricating oil, reducing resource waste and lowering production and maintenance costs. The entire process requires no additional manual intervention, adapting to continuous production needs and further ensuring the stability and convenience of the device's operation. It also prevents transmission failures caused by improper lubrication, indirectly improving overall production efficiency.

[0022] This invention provides a multi-cavity thread positioning injection mold for integrated injection molding of dual-material pick-up heads. Building upon the two aforementioned beneficial effects, it utilizes real-time detection by a pressure-sensitive diaphragm and precise control by a control chip, along with the angle correction function of a fine-tuning component. This allows for timely detection of meshing deviations between the active pinion assembly and the gear slot assembly. Precise fine-tuning via a telescopic adjustment fork corrects angular offsets, ensuring synchronization between the rotation of the active pinion assembly and the operation of the die thread rod assembly. This guarantees consistent rotation of the adjusting thread rod, thereby ensuring the thread forming accuracy of the dual-material pick-up head, preventing quality issues such as thread misalignment and burrs, improving product assembly smoothness, reducing defective products during production, lowering production losses, adapting to the demands of high-volume, high-precision production, further optimizing the production process, and enhancing production stability and product qualification rate. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention;

[0026] Figure 2 This is a top view of the overall structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the first internal structure of the present invention;

[0028] Figure 4 This is a schematic diagram of the second internal structure of the present invention;

[0029] Figure 5 This is a partial top view of the structure of the present invention;

[0030] Figure 6 This is a schematic diagram of the overall external structure of the transmission gear assembly of the present invention;

[0031] Figure 7 This is a schematic diagram of the overall appearance structure of the transmission gear assembly and the sliding base assembly of the present invention;

[0032] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point A;

[0033] Figure 9 This is a schematic side view of the overall structure of the transmission gear assembly and the sliding base assembly of the present invention;

[0034] Figure 10 For the present invention Figure 9 Enlarged structural diagram at point B;

[0035] Figure 11 This is a schematic cross-sectional view of the transmission gear assembly and sliding base assembly of the present invention;

[0036] Figure 12 This is an enlarged cross-sectional view of the transmission gear assembly of the present invention;

[0037] Figure 13 A top view of the overall structure of the transmission gear assembly and the sliding base assembly of the present invention;

[0038] Figure 14 For the present invention Figure 13 Enlarged structural diagram at point C;

[0039] Figure 15 This is an enlarged structural diagram of the dual-material collection head of the present invention.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Rack and pinion guide plate;

[0042] 2. Circuit-controlled mechanical cover plate;

[0043] 3. First side base; 31. Base mounting component; 32. Side upright plate assembly; 33. Circular rotating groove; 34. Drive pinion assembly; 341. Drive shaft; 342. Large gear; 343. Driven pinion; 344. Fine-tuning gear;

[0044] 345. Adjustment assembly; 3451. Telescopic adjustment fork; 3452. Electric control valve; 3453. Cylinder tank;

[0045] 4. Second side base;

[0046] 5. Transmission gear assembly; 51. Gear groove assembly; 511. Gear groove side baffle; 512. Gear groove; 513. Drain port; 514. Oil outlet; 52. Piston push rod; 53. External fixing seat; 54. Main oil chamber; 55. Auxiliary oil chamber; 56. Return oil collection chamber; 57. Oil bladder box; 58. Oil pipe;

[0047] 6. Sliding base assembly; 61. Sliding base; 62. Sliding block; 63. Sliding pin; 64. Transmission pin; 65. Sliding limit groove; 66. Fixed mounting base;

[0048] 7. Molded threaded rod assembly; 71. Quick-release mounting piece; 72. Height adjustment assembly; 73. Adjusting threaded rod; 74. Transmission pinion;

[0049] 75. Dual material collection head; 751. Rigid connecting part; 752. Annular sleeve; 753. Threaded connecting part; 754. Soft connecting part. Detailed Implementation

[0050] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0051] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] As attached Figure 1 To be continued Figure 15 As shown:

[0054] This invention provides a multi-cavity threaded injection mold for integrated injection molding of dual-material ear picks, including a sliding base assembly 6, a first side base 3 and a second side base 4 above the sliding base assembly 6, a transmission gear assembly 5 slidably disposed between the first side base 3 and the second side base 4, and a molded threaded rod assembly 7 rotatably mounted on the first side base 3 and the second side base 4.

[0055] A rack guide plate 1 is fixedly installed on the outside of the sliding base assembly 6. A circuit control mechanical cover plate 2 is fixedly installed above the first side base 3 and the second side base 4. An active pinion assembly 34 is provided inside the first side base 3. A circuit board and a control chip are provided inside the circuit control mechanical cover plate 2.

[0056] The transmission gear assembly 5 contains an oil sac box 57, a pressure-sensitive diaphragm, and oil-absorbing cotton. The movement of the sliding base assembly 6 drives the rotation of the drive pinion assembly 34, which in turn drives the die thread assembly 7 to rotate synchronously. The pressure-sensitive diaphragm can transmit the meshing accuracy of the drive pinion assembly 34 in real time, providing timely feedback on gear meshing pressure and transmission deviation, ensuring stable and reliable transmission, and preventing angular deviation caused by clearance changes or long-term wear. During the meshing and compression of the drive pinion assembly 34, the oil-absorbing cotton provides continuous and stable lubrication, effectively reducing gear tooth surface friction and wear, reducing the accumulation of transmission errors, ensuring that the rotation angle of all threads is highly uniform in multi-cavity production, and significantly improving product consistency and production yield.

[0057] Preferred options are shown in the appendix. Figure 7 The sliding base assembly 6 includes a sliding base 61, on which a fixed mounting base 66 is fixedly installed. A sliding block 62 is slidably provided below the sliding base 61. A sliding pin 63 is inserted inside the sliding block 62. A transmission pin 64 is fixedly connected to the sliding pin 63. A sliding limit groove 65 is provided on the sliding base 61. The transmission pin 64 moves inside the sliding limit groove 65 to keep the overall transmission path precisely constrained, avoid lateral swaying and transmission misalignment, ensure smooth and stable power transmission, and improve the overall stability of the mechanism.

[0058] Preferred options are shown in the appendix. Figure 5 The first side base 3 includes a base mounting part 31, and a side upright plate assembly 32 is provided on the inner side of the base mounting part 31. The base mounting part 31 is provided with a circular rotating groove 33. The second side base 4 is fixedly installed with a mold thread rod assembly 7. The mold thread rod assembly 7 includes two sets of quick-release mounting parts 71. Several sets of height adjustment components 72 are arrayed between the two sets of quick-release mounting parts 71. The several sets of height adjustment components 72 correspond to the circular rotating groove 33. An adjusting thread rod 73 is provided between the circular rotating groove 33 and the height adjustment component 72. A transmission pinion 74 is provided on the adjusting thread rod 73. A double material picker head 75 is fixedly connected to the end of the adjusting thread rod 73. This can realize the synchronous drive and synchronous rotation of multiple thread rods, ensuring that the demolding angle of all mold cavities is completely consistent with the thread forming accuracy, effectively solving the problems of inconsistent production angles of multiple mold cavities, assembly difficulties, and poor flash.

[0059] Preferred options are shown in the appendix. Figure 6 and appendix Figure 7 The transmission gear assembly 5 includes a gear groove assembly 51, on which a driving pinion assembly 34 is provided. The driving pinion assembly 34 includes a driving shaft 341, on which a large gear 342 and a driven pinion 343 are provided. The driven pinion 343 is located on one side of the first side base 3, and the large gear 342 is located on one side of the second side base 4. The driven pinion 343 is located on the gear groove assembly 51. The large gear 342 meshes and rotates with the transmission pinion 74, so that the transmission ratio remains constant and the rotation speed is uniform and stable, avoiding thread demolding failure or damage due to rotation speed fluctuations, and ensuring stable and reliable thread forming quality. Meanwhile, considering the space requirements for mold installation, the meshing of the active pinion assembly 34 and the transmission pinion 74 can adopt a series meshing structure (suitable for long-distance transmission). If space is limited, a sequential meshing series structure can also be used: the large gear first drives the medium gear, and the medium gear then drives the small gear, achieving the superposition of speeds through two stages of transmission: First stage: large gear (z=60) - medium gear (z=30), achieving large rotation 1 and medium rotation 2; Second stage: medium gear (z=30) - small gear (z=20), achieving medium rotation 2 and small rotation 3 (because when the medium gear rotates 2 revolutions, the small gear's speed = 2 × 30 / 20 = 3 revolutions). The advantage of this structure is that it can arrange the three gears in a straight line, suitable for transmission in narrow spaces, but it will accumulate transmission errors, and the accuracy is slightly lower than that of the parallel structure. It can be flexibly selected according to the actual installation space of the mold.

[0060] Preferred options are shown in the appendix. Figure 8 and appendix Figure 10The drive shaft 341 is also equipped with a fine-tuning gear 344, which is located on the side away from the driven pinion 343. Adjustment components 345 are fixedly installed on both sides of the fine-tuning gear 344. The adjustment components 345 are located at the upper end of the side plate assembly 32. The adjustment components 345 include a cylinder tank 3453, which is located inside the side plate assembly 32. An electric control valve 3452 is fixedly connected inside the cylinder tank 3453. A telescopic adjustment fork 3451 is fixedly connected to the upper end of the electric control valve 3452. It can perform independent angle fine-tuning according to the deviation signal fed back by the pressure-sensing diaphragm, and correct the angle deviation caused by gear wear in time, so that the multi-cavity screw thread angle is always consistent, further improving product accuracy and yield.

[0061] Preferred options are shown in the appendix. Figure 11 and appendix Figure 12 The transmission gear assembly 5 includes a gear groove assembly 51. The gear groove assembly 51 has two layers of partitions inside, which divide its interior into a main oil chamber 54, a secondary oil chamber 55, and a return oil collection chamber 56. Valves are provided between the main oil chamber 54, the secondary oil chamber 55, and the return oil collection chamber 56. A piston push rod 52 is slidably installed inside the secondary oil chamber 55. One end of the piston push rod 52 is fixedly connected to a piston, and the other end of the piston push rod 52 is fixedly connected to an external fixing seat 53. The external fixing seat 53 is fixedly installed on the outside of the first side base 3 and the second side base 4, forming a complete closed-loop oil circuit system. This system integrates lubricating oil storage, transportation, and recycling, preventing lubricating oil leakage from contaminating the mold and product, while improving lubricating oil utilization and reducing maintenance costs.

[0062] Preferred options are shown in the appendix. Figure 8 To be continued Figure 12 The gear groove assembly 51 includes a gear groove side baffle 511, and several sets of gear grooves 512 are provided between the gear groove side baffles 511. A drain port 513 is provided on the opposite side of the two sets of gear groove side baffles 511. A drain pipe is provided on the outside of the drain port 513. The other end of the drain pipe is connected to the inside of the return oil collection chamber 56. An oil outlet 514 is provided at the bottom of the bottom groove of the drain port 513. The oil outlet 514 is connected to the inside of the main oil chamber 54. A quantitative drain valve is provided at the connection between the main oil chamber 54 and the oil outlet 514, which can realize quantitative and accurate oil supply for each demolding cycle, ensure sufficient lubrication without over-lubrication, avoid excess grease accumulation affecting gear transmission and product quality, and keep the lubrication state stable for a long time.

[0063] Preferred options are shown in the appendix. Figure 8 To be continued Figure 12The main oil chamber 54 has an oil pipe 58 that slides inside. One end of the oil pipe 58 is also equipped with a piston, and the other end of the oil pipe 58 is fixedly connected to an oil bladder box 57. The oil bladder box 57 is equipped with multiple conduits, which are connected to the cylinder tank 3453. The piston squeezes and pushes the oil bladder to deform and generate air pressure, providing stable power to the cylinder tank 3453. No external air source or electric device is required, the structure is simpler and more reliable, the probability of failure is reduced, and it is suitable for long-term continuous production.

[0064] Preferred options are shown in the appendix. Figure 8 Oil-absorbing cotton is installed in the groove of the gear groove assembly 51, and a pressure-sensing membrane is laid in the groove of the gear groove assembly 51. The surface of the pressure-sensing membrane has multiple holes, which correspond to the oil-absorbing cotton, so that the pressure-sensing membrane can fit tightly against the gear surface and accurately detect the gear meshing pressure and rotation status in real time. At the same time, the oil-absorbing cotton can evenly absorb lubricating oil and slowly release it when the gear rotates, forming a uniform and stable oil film, which further reduces friction, reduces noise, and extends the service life of the gear.

[0065] Preferred options are shown in the appendix. Figure 15 The dual-material ear pick 75 includes an annular sleeve 752. A rigid connecting part 751 is fixedly connected to the outer side of the annular sleeve 752. A flexible connecting part 754 is fixedly connected above the rigid connecting part 751. A threaded connecting part 753 is provided on the inner side of the annular sleeve 752. The threaded connecting part 753 is threadedly connected to the front end of the adjusting screw rod 73. The dual-material structure takes into account both connection strength and safety of use. The uniform thread angle can achieve smooth assembly and avoid problems such as incomplete tightening, jamming, and stripping, thereby improving the user experience and overall product quality. The dual-material ear cleaning head 75 has a total length of 15mm and is integrally molded using dual-material, dual-color injection molding. The rigid connecting part 751 is 8mm long, made of rigid PC material with a Shore hardness of 88D, and has an M4 external thread at the end, which mates with the internal thread of the handheld end for a detachable connection. The soft cleaning part (i.e., the soft connecting part 754) is 7mm long, made of flexible TPU material with a Shore hardness of 70A, and is integrally injection molded with the rigid connecting part 751. The head of the cleaning part has an arc-shaped structure that mimics the ear canal, and the surface has an annular groove for collecting earwax. The soft material avoids scratching the ear canal. At the same time, the threaded connecting part 753 (internal thread) on the inner side of the annular sleeve 752 is designed with anti-angle deviation and anti-thread slippage features, further ensuring the connection stability between the dual-material ear cleaning head 75 and the adjusting thread rod 73, preventing thread offset and slippage during demolding and assembly, and ensuring product molding accuracy and reliability.

[0066] Specific usage of this invention:

[0067] When using this device, first install it on the mold worktable, connect the power supply of this device to the outside, then put the adjusting screw rod 73 into the mold, then fill the mold with rubber, then connect the external telescopic motor to the rack guide plate 1, and then the operator starts the telescopic motor to demold.

[0068] When demolding is achieved, the telescopic motor will push the rack guide plate 1, which will drive the sliding pin 63 and the sliding block 62 to move laterally. Then, the sliding pin 63 will drive the transmission pin 64 to move synchronously, and then the transmission pin 64 will drive the transmission gear assembly 5 to move synchronously.

[0069] When the transmission gear assembly 5 moves, the gear groove assembly 51 provided in the transmission gear assembly 5 will roll and rotate the driven pinion 343, and when the gear groove assembly 51 rotates and rolls, the driven pinion 343 will come into contact with the pressure-sensitive diaphragm and the oil-absorbing cotton.

[0070] When the gear slot assembly 51 moves, the slot surface of the gear slot 512 directly forms a rolling and pressing engagement with the tooth surface of the driven pinion 343. Under the rolling action, the driven pinion 343 is forced to rotate, ensuring that the rotation angle strictly corresponds to the displacement of the transmission gear assembly 5. The pressure-sensitive diaphragm inside the gear slot 512 is closely attached to the tooth surface of the driven pinion 343. Every time the gear rotates by one tooth pitch, the pressure-sensitive diaphragm will collect the tooth surface pressure distribution, meshing clearance change, rotational resistance fluctuation, and position offset signal in real time, converting the mechanical state into an electrical signal and transmitting it back to the control chip. This achieves real-time monitoring of meshing accuracy throughout the entire process, and any deviation will be immediately captured, preventing error accumulation.

[0071] Subsequently, when the driven pinion 343 rotates, it will drive the large gear 342 to rotate. When the large gear 342 rotates, it will mesh with the transmission pinion 74. Then, when the transmission pinion 74 rotates, it will drive the adjusting screw rod 73 to rotate. When the adjusting screw rod 73 rotates, the molded screw rod assembly 7, which is located above the first side base 3 and the second side base 4, will rotate synchronously. After synchronous rotation, the adjusting screw rod 73 will disengage from the double material picking head 75. After the double material picking head 75 disengages, the mold can be opened and the double material picking head 75 can be taken out, thereby achieving a uniform rotation ratio and ensuring that the threads of all double material picking heads 75 are consistent.

[0072] Subsequently, when the telescopic motor extends or retracts, the piston push rod 52 located in the transmission gear assembly 5 will drive the piston at its end to squeeze and move. After the piston push rod 52 squeezes, it will push the lubricating oil in the auxiliary oil chamber 55 into the main oil chamber 54. Then, when the oil chamber inside the main oil chamber 54 forms a squeeze piston plate, the squeeze piston plate will cause it to pass through the squeeze oil bladder box 57. After the oil bladder box 57 is squeezed and deformed, the adsorbed gas will be discharged into the cylinder tank 3453. This continuous use will create a pressure chamber inside the cylinder tank 3453.

[0073] When the oil inside the main oil chamber 54 is discharged through the metered discharge valve, it will meteredly discharge the oil-absorbing cotton in the gear groove 512. When the main oil chamber 54 is continuously squeezed, the control chip inside the circuit-controlled mechanical cover plate 2 will control the metered discharge valve in real time through electrical control. When demolding once, the metered discharge valve will discharge lubricating oil only once. After the oil is discharged, it will contact the driven pinion 343 to achieve lubrication. When it contacts and squeezes, the oil-absorbing cotton will squeeze out the excess oil, which will flow in the gear groove 512. When it flows, it will enter the oil return collection chamber 56 through the discharge port 513 and the discharge pipe. Then, when the piston push rod 52 is pulled back, it will drive the oil volume of the main oil chamber 54 and the auxiliary oil chamber 55 to recover. When the oil in the auxiliary oil chamber 55 and the main oil chamber 54 is insufficient, the piston push rod 52 will pull the recovered oil in the oil collection chamber 56 back into the auxiliary oil chamber 55 for recycling.

[0074] After the main oil chamber 54 is pressurized, the internal oil pressure drives the quantitative discharge valve to open, allowing only a fixed volume of lubricating oil to flow out each time the mold is demolded, achieving precise single-quantity oil supply. The lubricating oil flows evenly into the gear groove 512 from the oil outlet 514, directly saturating the oil-absorbing cotton and keeping it moist but not dripping. When the driven pinion 343 rotates, the tooth surface is in continuous contact with the oil-absorbing cotton, evenly coating the entire tooth surface with an oil film, achieving a state of no dry friction and no local oil shortage throughout the process, reducing tooth surface wear from the root.

[0075] Excess lubricating oil overflowing from the absorbent cotton after being squeezed by the gears will not scatter inside the mold. Instead, it will flow along the bottom of the gear groove 512 to the drain ports 513 on both sides, and then be temporarily stored in the return oil collection chamber 56 through the drain pipe. When the piston rod 52 retracts, a negative pressure is formed inside the auxiliary oil chamber 55 and the main oil chamber 54, which draws the clean oil in the return oil collection chamber 56 back to the auxiliary oil chamber 55 for the next lubrication cycle. This achieves a closed-loop recycling and reuse of lubricating oil, which avoids wasting oil and contaminating the mold and dual-material products, maintaining a high level of cleanliness inside the mold.

[0076] Subsequently, when the driven pinion 343 rotates and compacts, the driven pinion 343 will detect the rotation accuracy in real time with the pressure-sensitive diaphragm. When the rotation accuracy decreases, and the meshing accuracy of the driven pinion 343 with the gear slot assembly 51 exceeds the error, the control chip inside the circuit-controlled mechanical cover 2 will automatically process the issue. After automatic processing, single-group adjustment will be achieved by opening the single-group adjustment assembly 345. If the accuracy increases by 1, the telescopic adjustment fork 3451 on the left side will extend or retract due to the air volume discharged by the electronically controlled valve 3452, thereby pushing the fine-tuning gear 344 to rotate to achieve a -1 degree. If a -1 degree deviation occurs, the process will reverse. After the adjustment is completed, the adjustment assembly 345 can be retracted, and the reciprocating motion of the transmission gear assembly 5 will refill the cylinder tank 3453 for standby.

[0077] Through the synergistic action of the main oil chamber 54, the auxiliary oil chamber 55, and the oil-absorbing cotton within the transmission gear assembly 5, combined with the precise control of the metering drain valve, a stable supply and uniform application of lubricating oil are achieved. This, along with the rolling transmission of the gear groove assembly 51, ensures that the lubricating oil evenly covers the tooth surface of the active pinion assembly 34, forming a complete lubrication protective film. This effectively reduces frictional loss between the active pinion assembly 34 and the gear groove assembly 51, preventing tooth surface wear, jamming, and other problems. Simultaneously, it prevents lubricating oil leakage from contaminating the mold and the dual material picker head 75, ensuring the stable operation of the active pinion assembly 34, extending the service life of gears, shafts, and other components, ensuring smooth transmission, laying the foundation for subsequent precise transmission, and avoiding potential hazards such as component damage and transmission jamming due to insufficient lubrication.

[0078] Based on the aforementioned beneficial effects, the precise control of the quantitative drain valve, combined with the oil storage and release characteristics of the oil-absorbing cotton, enables the quantitative supply and recycling of lubricating oil. This avoids mold contamination and molding defects of the dual-material ear head 75 caused by excessive lubricating oil, as well as tooth surface wear caused by insufficient lubricating oil. At the same time, the closed-loop oil return channel design, consisting of the gear groove assembly 51, drain port 513, drain pipe, and oil return collection chamber 56, allows excess lubricating oil to be recycled and reused, reducing resource waste and production and maintenance costs. Moreover, no additional manual intervention is required throughout the process, making it suitable for continuous production needs. This further ensures the stability and convenience of the device operation, avoids transmission failures caused by improper lubrication, and indirectly improves overall production efficiency.

[0079] Based on the two beneficial effects mentioned above, the real-time detection of the pressure-sensitive diaphragm inside the gear groove assembly 51 and the precise control of the internal control chip of the circuit-controlled mechanical cover plate 2, combined with the angle correction function of the adjustment component 345, can promptly detect the meshing deviation between the active pinion assembly 34 and the gear groove assembly 51. Through the precise fine-tuning of the telescopic adjustment fork 3451, the angle deviation of the fine-tuning gear 344 is corrected, ensuring that the rotation of the active pinion assembly 34 and the operation of the die screw assembly 7 remain synchronized, ensuring the rotation consistency of the adjustment screw 73, thereby ensuring the thread forming accuracy of the dual material picker head 75, avoiding quality problems such as thread misalignment and burrs, improving the smoothness of product assembly, reducing the generation of defective products in the production process, reducing production losses, adapting to the needs of large-volume and high-precision production, further optimizing the production process, and improving production stability and product qualification rate.

[0080] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A multi-cavity threaded injection mold for integrated injection molding of dual material picker heads, comprising a sliding base assembly (6), wherein a first side base (3) and a second side base (4) are provided above the sliding base assembly (6), a transmission gear assembly (5) is slidably provided between the first side base (3) and the second side base (4), and a reverse die threaded rod assembly (7) is rotatably mounted on the first side base (3) and the second side base (4); Its features are: A rack guide plate (1) is fixedly installed on the outside of the sliding base assembly (6). A circuit control mechanical cover plate (2) is fixedly installed above the first side base (3) and the second side base (4). An active pinion assembly (34) is provided inside the first side base (3). A circuit board and a control chip are provided inside the circuit control mechanical cover plate (2). The transmission gear assembly (5) is equipped with an oil bladder box (57), a pressure-sensitive diaphragm, and oil-absorbing cotton inside. The sliding base assembly (6) moves to drive the active pinion assembly (34) to rotate. The active pinion assembly (34) cooperates with the die screw assembly (7). The pressure-sensitive diaphragm monitors the meshing accuracy of the active pinion assembly (34) in real time and feeds back a signal. During the meshing operation of the active pinion assembly (34), it adheres to the oil-absorbing cotton for adaptive lubrication, suppressing transmission wear and positional errors. The transmission gear assembly (5) includes a gear slot assembly (51), on which a driving pinion assembly (34) is provided; the driving pinion assembly (34) includes a driving shaft (341), on which a large gear (342) and a driven pinion (343) are provided. The driven pinion (343) is correspondingly located on one side of the first side base (3), and the large gear (342) is correspondingly located on one side of the second side base (4). The driven pinion (343) is assembled on the gear slot assembly (51), and the large gear (342) and the transmission pinion (74) mesh with each other for transmission. The drive shaft (341) is also provided with a fine-tuning gear (344), which is located on the side away from the driven pinion (343). Adjustment components (345) are fixedly installed on both sides of the fine-tuning gear (344), and the adjustment components (345) are installed on the upper end of the side plate assembly (32). The adjustment components (345) include a cylinder tank (3453), which is embedded in the side plate assembly (32). An electric control valve (3452) is fixedly connected inside the cylinder tank (3453), and a telescopic adjustment fork (3451) is fixedly connected to the upper end of the electric control valve (3452).

2. The multi-cavity threaded injection mold for integrated injection molding of dual-material picker heads according to claim 1, characterized in that: The sliding base assembly (6) includes a sliding base (61), on which a fixed mounting base (66) is fixedly installed. A sliding block (62) is slidably disposed below the sliding base (61). A sliding pin (63) is inserted inside the sliding block (62). A transmission pin (64) is fixedly connected to the sliding pin (63). The sliding base (61) has a sliding limiting groove (65), and the transmission pin (64) is slidably limited inside the sliding limiting groove (65).

3. The multi-cavity threaded injection mold for integrated injection molding of dual-material picker heads according to claim 1, characterized in that: The first side base (3) includes a base mounting component (31), and a side upright plate assembly (32) is provided on the inner side of the base mounting component (31). The base mounting component (31) has a circular rotating groove (33). A molded threaded rod assembly (7) is fixedly installed on the second side base (4). The molded threaded rod assembly (7) includes two sets of quick-release mounting components (71). Several sets of height adjustment components (72) are arranged in an array between the two sets of quick-release mounting components (71). The several sets of height adjustment components (72) correspond to the circular rotating groove (33). An adjusting threaded rod (73) is provided between the circular rotating groove (33) and the height adjustment component (72). A transmission pinion (74) is provided on the adjusting threaded rod (73). A double material picker head (75) is fixedly connected to the end of the adjusting threaded rod (73).

4. The multi-cavity threaded injection mold for integrated injection molding of dual-material picker heads according to claim 1, characterized in that: The gear slot assembly (51) is provided with two layers of partitions, which divide the interior of the gear slot assembly (51) into a main oil chamber (54), a secondary oil chamber (55), and a return oil collection chamber (56). Valves are provided between the main oil chamber (54), the secondary oil chamber (55), and the return oil collection chamber (56). A piston push rod (52) is slidably provided inside the secondary oil chamber (55). One end of the piston push rod (52) is connected to a piston, and the other end of the piston push rod (52) is fixedly connected to an external fixing seat (53). The external fixing seat (53) is fixedly installed on the outside of the first side base (3) and the second side base (4).

5. The multi-cavity threaded injection mold for integrated injection molding of dual-material picker heads according to claim 4, characterized in that: The gear groove assembly (51) includes a gear groove side baffle (511), and a plurality of gear grooves (512) are provided between the two sets of gear groove side baffles (511); a drain port (513) is provided on the opposite side of the two sets of gear groove side baffles (511), the drain port (513) is connected to a drain pipe, and the other end of the drain pipe is connected to the return oil collection chamber (56); an oil outlet groove (514) is provided at the bottom of the drain port (513), the oil outlet groove (514) is connected to the main oil chamber (54), and a metering drain valve is provided at the connection between the main oil chamber (54) and the oil outlet groove (514).

6. The multi-cavity threaded injection mold for integrated injection molding of dual-material picker heads according to claim 5, characterized in that: The main oil chamber (54) is equipped with an oil pipe (58) that slides inside. One end of the oil pipe (58) is equipped with a piston, and the other end of the oil pipe (58) is fixedly connected to an oil bladder box (57). The oil bladder box (57) is connected to multiple conduits, and the multiple conduits are respectively connected to the cylinder tank (3453).

7. The multi-cavity threaded injection mold for integrated injection molding of dual-material picker heads according to claim 6, characterized in that: Oil-absorbing cotton is installed in the gear groove (512), and a pressure-sensitive membrane is laid in the gear groove (512). The surface of the pressure-sensitive membrane has multiple holes, and the multiple holes correspond to the positions of the oil-absorbing cotton.

8. The multi-cavity threaded injection mold for integrated injection molding of dual-material picker heads according to claim 3, characterized in that: The dual-material ear-collecting head (75) includes an annular sleeve (752), a rigid connecting part (751) is fixedly connected to the outside of the annular sleeve (752), and a soft connecting part (754) is fixedly connected above the rigid connecting part (751); a threaded connecting part (753) is provided on the inside of the annular sleeve (752), and the threaded connecting part (753) is threadedly connected to the front end of the adjusting screw rod (73).

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