A quick replacement structure of a pin

Abstract

The utility model discloses a kind of quick replacement structure of insert needle, including die blank, die, insert needle, connecting rod and headless screw, die is fixed in the front end inside die blank, and insert needle mounting hole is opened, for accommodating insert needle front section;Connecting rod is located inside die blank and is located at the rear end of die, and opening hole is opened through front and rear two ends, insert needle is arranged in the opening hole and is fixed by thread with the front end hole section of connecting rod;Headless screw is assembled in the rear end hole section of opening hole, and is connected with die by thread, after tightening, connecting rod can be fixed in die.In installing insert needle, only need to push connecting rod into die blank, make the rear end of insert needle and connecting rod thread connection, then pass through headless screw fixed connecting rod, when disassembling, unscrew headless screw and remove the thread connection of insert needle and connecting rod, insert needle can be extracted from insert needle mounting hole, whole process does not need to disassemble die.The application realizes that insert needle can be quickly installed and disassembled without disassembling die, improves replacement efficiency, and protects insert needle precision structure.

Description

Technical Field

[0001] This utility model relates to the technical field of mold accessories, and in particular to a quick-change structure for insert pins. Background Technology

[0002] As a key forming part in the mold, the insert pin is prone to wear, deformation or damage during long-term use, and needs to be disassembled and replaced regularly to ensure the forming accuracy of the mold.

[0003] Currently, the traditional method for installing and replacing inserts in the industry is as follows: traditional inserts are directly assembled inside the mold core. When insert replacement is needed, the entire mold core must first be removed from the mold blank, and then the insert is knocked off the mold core by a tool from the front end of the mold core. This replacement method is not only cumbersome, requiring the removal of the mold core's fixing structure (such as screws and locating pins) before disassembling the mold core and knocking off the insert, the entire process is time-consuming and seriously affects the mold's production efficiency. Moreover, the knocking of the insert's front end during disassembly often results in the deformation or breakage of the insert's front end due to the impact force, reducing the insert's reusability and increasing mold maintenance costs. Therefore, the existing insert replacement method suffers from low efficiency and easy damage to parts. Utility Model Content

[0004] This invention aims to at least partially solve one of the problems in the related art. Therefore, one objective of this invention is to provide a quick-change pin structure, enabling the rapid installation and removal of pins without disassembling the mold core, thereby improving replacement efficiency and protecting the precision structure of the pins.

[0005] A quick-change pin structure, the quick-change pin structure comprising: Furthermore, the outer peripheral surface of the rear end of the insert is machined with an external thread, and the front end of the opening is machined with an internal thread that matches the external thread at the rear end of the insert. The insert and the connecting rod are threadedly connected by the external thread and the internal thread.

[0006] Furthermore, the opening is a stepped hole, the diameter of the rear end section of the stepped hole is larger than that of the front end section, the rear end section of the stepped hole is used to accommodate a headless screw, and the front end section is used to accommodate the insert pin.

[0007] Furthermore, the rear end of the insert is provided with threads.

[0008] Furthermore, the top of the connecting rod is flush with the top of the mold blank.

[0009] Furthermore, the top of the mold blank is provided with a countersunk hole adapted to the headless screw, and the top of the headless screw is accommodated in the countersunk hole.

[0010] Furthermore, the opening of the countersunk hole is chamfered.

[0011] Furthermore, the depth of the countersunk hole is greater than the height of the headless screw head.

[0012] Furthermore, the outer peripheral surface of the insert pin is fitted to the inner wall of the insert pin mounting hole.

[0013] Furthermore, the inner wall of the pin mounting hole is provided with a wear-resistant coating, and the wear-resistant coating is made of titanium nitride.

[0014] The technical solutions provided in this application have the following advantages compared with the prior art: This application allows for the installation and removal of inserts without disassembling the mold core, eliminating the cumbersome process of mold core disassembly and reassembly, shortening replacement time, significantly reducing mold downtime, and improving production efficiency. The insert and connecting rod are fixed via a threaded connection, eliminating the need to strike the insert's front end during disassembly, completely preventing deformation and damage to the insert's front molding features, increasing the insert's reusability, and reducing mold maintenance costs. This application enables rapid installation and removal of inserts without disassembling the mold core, improving replacement efficiency and protecting the insert's precision structure. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] In the attached image: Figure 1 This is a schematic diagram of one embodiment of the quick-change pin structure of this application; Figure 2 This is a schematic diagram of another embodiment of the quick-change pin structure of this application; Figure 3 for Figure 2 Sectional view of section A in the middle; Figure 4 This is a schematic diagram of the structure of the quick-change pin structure of this application, showing the combination of the pin, connecting rod and headless screw. Figure 5 This is a cross-sectional view of the pin, connecting rod, and headless screw in one embodiment of the pin quick-change structure of this application.

[0018] Figure label: 10. Mold blank; 20. Mold core; 30. Insert pin; 40. Connecting rod; 50. Headless screw. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] like Figure 1 - Figure 5 As shown, this application provides a quick-change structure for a pin 30, comprising: Mold blank 10; Mold core 20 is fixedly assembled on the inner side of the front end of mold blank 10. The center of mold core 20 is provided with a pin 30 mounting hole that is adapted to the pin 30. The pin 30 mounting hole passes through the front and rear ends of mold core 20 and is used to accommodate the pin 30. A pin 30, the front end of which can be inserted into a mounting hole; A connecting rod 40 is disposed inside the mold blank 10 and located at the rear end of the mold core 20. The connecting rod 40 has openings extending through both its front and rear ends. A pin 30 passes through the openings, and the rear end of the pin 30 is threadedly connected to the front end of the connecting rod 40. A headless screw 50 is fitted into the rear end hole of the opening and is threadedly connected to the mold blank 10. By tightening the headless screw 50, the connecting rod 40 can be fixed inside the mold blank 10.

[0022] Traditionally, replacing the insert pin 30 requires first removing the fixing screws and locating pins of the mold core 20, and then tapping the insert pin 30 to detach it. This process is time-consuming and can easily damage parts. However, this structure, through the cooperation of the connecting rod 40 and the headless screw 50, only requires operating the threaded connection between the headless screw 50 and the insert pin 30 during replacement, eliminating the need to touch the mold core 20. This saves a significant amount of time on mold core 20 disassembly and assembly, greatly reducing mold downtime and improving production efficiency. Simultaneously, the threaded connection replaces the traditional tapping method, avoiding external force impacting the precision forming features (such as fine lines and irregular structures) of the insert pin 30's front end, effectively preventing deformation or breakage, increasing the reusability of the insert pin 30, reducing frequent procurement and replacement costs due to insert pin 30 damage, and lowering overall mold maintenance costs. Furthermore, the modular assembly design of each component enhances structural stability, ensuring the insert pin 30 maintains precise positioning after installation, guaranteeing that mold forming accuracy is not affected by replacement operations, further ensuring consistent product quality.

[0023] Furthermore, the outer peripheral surface of the rear end of the insert pin 30 is machined with an external thread, and the front end of the opening is machined with an internal thread that matches the external thread at the rear end of the insert pin 30. The insert pin 30 and the connecting rod 40 are threadedly connected by the external thread and the internal thread.

[0024] The threaded connection allows for the fixing or separation of the insert pin 30 and the connecting rod 40 through rotation, eliminating the need for impact force during operation. This fundamentally avoids damage such as deformation and cracks caused by impact to the precision-formed structure at the front end of the insert pin 30, greatly improving the reusability of the insert pin 30 and reducing the parts cost for mold maintenance. Simultaneously, the threaded connection provides excellent fastening, firmly fixing the insert pin 30 in position even during high-speed mold operation or under high molding pressure, preventing product molding deviations caused by insert pin displacement and ensuring product quality stability. Furthermore, the detachability of the threaded connection allows operators to disassemble it using only a conventional wrench without the need for complex tools, simplifying the operation process and shortening the replacement time. Especially in mass production scenarios, this reduces mold downtime and improves overall production efficiency.

[0025] Furthermore, the opening is a stepped hole, the diameter of the rear end section of the stepped hole is larger than that of the front end section, the rear end section of the stepped hole is used to accommodate the headless screw 50, and the front end section is used to accommodate the insert pin 30.

[0026] The functional partitioned hole design avoids spatial conflicts between the headless screw 50 and the insert pin 30 during installation, ensuring that each component can function independently without affecting others, thus reducing the risk of assembly errors. The larger hole at the rear end provides ample operating space for the installation and removal of the headless screw 50, eliminating concerns about tools colliding with other components and improving operational convenience. This design is particularly important in scenarios with limited internal space in the mold blank 10. Secondly, the stepped structure of the stepped hole can provide a certain degree of restraint for the headless screw 50. When tightening the headless screw 50, the step can withstand some pressure, preventing the headless screw 50 from being over-tightened and damaging the connecting rod 40, thus extending the service life of the connecting rod 40. At the same time, the stepped hole design makes the force on the connecting rod 40 more even, better transmitting and distributing molding pressure during mold operation, reducing deformation of the connecting rod 40 due to excessive localized force, ensuring the stability of the overall structure, and thus ensuring the positioning accuracy of the insert pin 30 and improving the product molding quality.

[0027] Furthermore, the rear end of the insert 30 is provided with threads.

[0028] The end threads are compatible with standard tools, allowing operators to smoothly apply rotational force to easily unscrew the insert 30. This avoids damage to the insert 30 and mold core 20 from external forces, protecting the integrity of the parts and extending the service life of the mold core 20. Simultaneously, the precise tool fit reduces operational errors during disassembly, such as hand injuries or parts collisions due to tool slippage, improving operational safety. Furthermore, even if the insert 30 develops slight rust or jamming after long-term use, the end threads and tool can gradually release the jamming through controlled rotational force, preventing irreversible damage to the parts caused by forced disassembly. This further increases the reusability of the insert 30 and reduces mold maintenance costs.

[0029] Furthermore, the top of the connecting rod 40 is flush with the top of the mold blank 10.

[0030] First, the flat surface of the mold blank 10 eliminates potential safety hazards caused by the protrusion of the connecting rod 40, such as scratches to operators during mold maintenance or assembly deviations caused by the protrusion during the installation of other components, thus improving the safety and assembly accuracy of the mold. Second, the flush structure facilitates subsequent cleaning and maintenance of the mold. The absence of depressions or gaps on the surface of the mold blank 10 reduces the accumulation of dust, oil, and other impurities, lowers the difficulty of cleaning, helps maintain the cleanliness of the mold interior, and extends the mold's service life. Furthermore, from a structural mechanics perspective, the flush design ensures more even stress distribution between the connecting rod 40 and the mold blank 10. When the mold is subjected to molding pressure, the pressure can be evenly transmitted to the connecting rod 40 through the mold blank 10, avoiding localized stress concentration caused by the protrusion of the connecting rod 40, reducing the risk of deformation of the connecting rod 40, ensuring the overall structural stability, and thus ensuring the positioning accuracy of the insert 30 during operation, improving the product molding quality.

[0031] Furthermore, the top of the mold blank 10 is provided with a countersunk hole adapted to the headless screw 50, and the top of the headless screw 50 is accommodated in the countersunk hole.

[0032] First, the head of the headless screw 50 is housed within the countersunk hole, keeping the top of the mold blank 10 flat. This prevents accidental bumps and scratches caused by the exposed head, or interference with the movement of other mold components (such as the ejection mechanism and guide components), ensuring smooth operation of all mold mechanisms, reducing downtime due to component interference, and improving production efficiency. Second, the countersunk hole provides positioning and guidance for the headless screw 50. When installing the headless screw 50, the countersunk hole guides the screw to accurately align with the threaded hole, reducing installation deviations and improving assembly efficiency. This is especially beneficial for novice operators, reducing assembly difficulty and operational errors. Furthermore, the sidewalls of the countersunk hole provide support when the headless screw 50 is under pressure, preventing the screw from tilting or deforming due to excessive force. This enhances the fixing effect of the headless screw 50 on the connecting rod 40, thereby ensuring the stability of the insert pin 30 during operation, preventing displacement of the insert pin 30 due to screw loosening, and improving product molding accuracy. Furthermore, the opening of the countersunk hole is chamfered.

[0033] First, when installing or removing the headless screw 50, the smooth bevel formed by the chamfer guides tools (such as Allen wrenches) to accurately insert into the countersunk hole, preventing slippage or jamming due to sharp edges. This significantly reduces operational difficulty, improves assembly and disassembly efficiency, and shortens replacement time, especially in situations with insufficient lighting or limited operating space inside the mold. Second, the chamfer eliminates sharp edges at the countersunk hole opening, preventing scratches to operators' hands during maintenance and improving operational safety. Furthermore, sharp edges are prone to burr formation due to collisions and friction over long-term use. These burrs may affect tool operation or scratch the surface of the headless screw 50. The chamfer design prevents burr formation from the outset, protecting the integrity of the headless screw 50 and tools, and extending their service life. In addition, the chamfer reduces stress concentration at the countersunk hole opening, preventing cracking due to long-term stress, enhancing the structural strength of the countersunk hole, and ensuring the overall structural stability.

[0034] Furthermore, the depth of the countersunk hole is greater than the height of the head of the headless screw 50.

[0035] First, the completely concealed headless screw 50 does not form a protrusion on the surface of the mold base 10, ensuring that the top of the mold base 10 remains absolutely flat. This avoids collisions and friction between protruding parts and other mold components (such as templates and transport equipment) during contact or movement, preventing component wear or deformation, reducing the risk of mold failure, and extending the overall service life of the mold. Second, the concealed design effectively protects the head of the headless screw 50, preventing damage from external impacts, oil corrosion, or dust accumulation. It ensures that the grooves (such as internal hexagonal sockets) of the screw head remain clear, facilitating precise tool fitting during subsequent disassembly and avoiding disassembly difficulties caused by head damage, thus reducing maintenance time and costs. In addition, the completely concealed structure also improves the cleanliness of the mold's appearance, reducing the accumulation of dust and impurities in the gap between the screw head and the countersunk hole, reducing cleaning difficulty, facilitating daily mold maintenance, and showcasing a more professional manufacturing process during mold acceptance or customer inspection.

[0036] Furthermore, the outer peripheral surface of the insert 30 is fitted to the inner wall of the mounting hole of the insert 30.

[0037] First, the seamless fit ensures that the insert 30 maintains a precise position throughout the molding process, preventing displacement due to mold vibration or molding pressure. This guarantees dimensional accuracy and surface quality, avoiding defects such as flash and dimensional deviations caused by insert 30 displacement, reducing the number of defective products and lowering production costs. Second, the seamless fit ensures more even stress distribution between the insert 30 and the mounting hole. Under molding pressure, the pressure is evenly transmitted to the insert 30 through the inner wall of the mounting hole, preventing deformation or breakage due to excessive localized stress and extending the lifespan of the insert 30. Simultaneously, the gapless design effectively prevents molten material or impurities from entering the gap between the insert 30 and the mounting hole, preventing material solidification and impurity accumulation. This avoids insert 30 jamming or mounting hole wear, reducing mold maintenance frequency and costs. Furthermore, the seamless fit improves the ease of insert 30 installation and removal. With no impurities accumulating on the mating surface, the insert 30 can be easily pulled out of the mounting hole during disassembly and accurately inserted during installation, further shortening replacement time.

[0038] Furthermore, the inner wall of the mounting hole of the insert 30 is provided with a wear-resistant coating, and the wear-resistant coating is made of titanium nitride.

[0039] Titanium nitride material possesses extremely high hardness and wear resistance, with a hardness exceeding HV2000, far surpassing that of the mold core 20 base material (such as steel). This effectively resists frictional wear between the insert pin 30 and the inner wall of the mounting hole during frequent disassembly and assembly, preventing issues like dimensional enlargement and surface roughness caused by long-term wear. It ensures the mounting hole maintains precise dimensions and a smooth surface, guaranteeing a tight fit between the insert pin 30 and the mounting hole, maintaining stable product molding accuracy, and preventing product quality degradation due to mounting hole wear. Secondly, the coating reduces the coefficient of friction between the insert pin 30 and the mounting hole, making insertion and disassembly smoother, reducing operational resistance and minimizing operator fatigue. It also prevents damage to the insert pin 30 or mounting hole due to excessive friction, further improving part reuse rates. In addition, the wear-resistant coating extends the maintenance cycle of the mounting holes, eliminating the need for frequent repairs or replacements of the mold core 20. This significantly reduces mold downtime and maintenance costs, especially in scenarios involving mass production or frequent replacement of insert pins 30, thereby significantly improving the overall efficiency and economy of the mold.

[0040] The installation and disassembly process of the quick-change pin 30 structure of this utility model in actual use is as follows: Installation process for pin 30: Push the connecting rod 40 into the mold base 10 so that the top of the connecting rod 40 is flush with the top of the mold base 10; Align the rear end of the insert pin 30 with the opening of the connecting rod 40, push the insert pin 30 forward so that the rear end of the insert pin 30 is inserted into the opening of the insert pin 30 and into the mounting hole of the insert pin 30. Align the front end of the stepped hole of the connecting rod 40 with the external thread of the rear end of the insert pin 30, and rotate the connecting rod 40 so that the connecting rod 40 and the insert pin 30 are fixed by thread connection. Insert the headless screw 50 into the rear end of the stepped hole of the connecting rod 40 from the top of the mold blank 10, and tighten the headless screw 50 by rotating it so that the headless screw 50 is threadedly connected to the mold blank 10, thereby fixing the connecting rod 40 inside the mold blank 10 and completing the installation of the insert 30.

[0041] Disassembly procedure for pin 30: Use a tool (such as an Allen wrench) to unscrew the headless screw 50 from the countersunk hole at the top of the mold blank 10 to release the headless screw 50 from fixing the connecting rod 40. Then use a tool (such as an Allen wrench) to unscrew the insert 30 from the opening, release the fixing restriction of the connecting rod 40 on the insert 30, and disengage the connecting rod 40 from the insert 30 from the threaded connection. Pull the insert pin 30 backward to remove it from the insert pin 30 mounting hole in the mold core 20, thus completing the removal of the insert pin 30; if a new insert pin 30 needs to be installed, repeat the above installation process.

[0042] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A quick-change pin structure, characterized in that, include: mold blank; The mold core is fixedly assembled on the inner side of the front end of the mold blank. The center of the mold core is provided with a pin mounting hole that is adapted to the pin. The pin mounting hole passes through the front and rear ends of the mold core and is used to accommodate the pin. A pin, the front end of which can be inserted into a pin mounting hole; A connecting rod is disposed inside the mold blank and located at the rear end of the mold core. The connecting rod has openings extending through its front and rear ends. The insert pin passes through the openings, and the rear end of the insert pin is threadedly connected and fixed to the front end of the connecting rod. A headless screw is fitted into the rear end section of the opening and is threadedly connected to the mold blank. The connecting rod can be fixed inside the mold blank by tightening the headless screw.

2. The quick-change pin structure according to claim 1, characterized in that, The outer peripheral surface of the rear end of the insert is machined with an external thread, and the front end of the opening is machined with an internal thread that matches the external thread at the rear end of the insert. The insert and the connecting rod are threadedly connected by the external thread and the internal thread.

3. The quick-change pin structure according to claim 1, characterized in that, The opening is a stepped hole, with the diameter of the rear end section of the stepped hole being larger than that of the front end section. The rear end section of the stepped hole is used to accommodate a headless screw, and the front end section of the stepped hole is used to accommodate the insert pin.

4. The quick-change pin structure according to claim 1, characterized in that, The rear end of the insert is provided with threads.

5. The quick-change pin structure according to claim 1, characterized in that, The top of the connecting rod is flush with the top of the mold blank.

6. The quick-change pin structure according to claim 1, characterized in that, The top of the mold blank has a countersunk hole adapted to the headless screw, and the top of the headless screw is accommodated in the countersunk hole.

7. The quick-change pin structure according to claim 6, characterized in that, The opening of the countersunk hole is chamfered.

8. The quick-change pin structure according to claim 6, characterized in that, The depth of the countersunk hole is greater than the height of the headless screw.

9. The quick-change pin structure according to claim 1, characterized in that, The outer peripheral surface of the insert pin is fitted to the inner wall of the insert pin mounting hole.

10. The quick-change pin structure according to claim 1, characterized in that, The inner wall of the pin mounting hole is provided with a wear-resistant coating, and the wear-resistant coating is made of titanium nitride.

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