A cold runner system integrated BMC injection mold structure

Abstract

This invention relates to the field of mold technology, and in particular to a cold runner system integrated BMC injection mold structure, including a fixed mold section and a moving mold section, with a workpiece forming cavity between the fixed mold section and the moving mold section for forming workpieces; it also includes a detachable runner section structure mounted on the fixed mold section; the runner section structure has a feed insert rod with an axially penetrating feed hole, and the feed insert rod is axially slidably fitted into a mating hole in the fixed mold section structure, such that the inner end of the feed hole on the feed insert rod communicates with the workpiece forming cavity between the fixed mold section and the moving mold section; the runner section structure also has a sprue sleeve for docking with the injection molding machine nozzle. This invention features a simpler and more rational structural design, improved mold change efficiency, reduced mold costs, and easier maintenance of the runner system.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and in particular to a cold runner system integrated BMC injection mold structure. Background Technology

[0002] Molds are fundamental process equipment in industrial production, often referred to as the "mother of industry." They are core tools used to process materials into products of specific shapes and sizes through methods such as injection molding, blow molding, extrusion, die casting, forging, and stamping. The manufacture of almost all industrial products (from everyday items to aerospace components) is inseparable from molds, and their precision and quality directly determine the performance and appearance of the final product.

[0003] In existing molds, the injection molding machine nozzle engages with the sprue bushing on the fixed mold section. Fluid plastic flows from the nozzle, passes through the sprue bushing and the runner system on the mold, and then enters the molding cavity. After cooling, the mold opens to produce the product. The existing mold design has the following drawbacks: 1. The runner system is integrated into the fixed mold section. When replacing the mold installed on the injection molding machine, to improve operational safety, it's necessary to wait for the runner system to cool down before replacement. This increases the waiting time for mold replacement, leading to longer downtime for the injection molding machine and wasting operating time. 2. The runner system design in existing molds is not universal, increasing mold costs. 3. The runner system's integration into the fixed mold section makes separate maintenance of the runner system inconvenient and increases the risk of runner blockage.

[0004] Therefore, how to design a cold runner system integrated BMC injection mold structure with a simpler and more reasonable structural design, which can improve mold change efficiency, reduce mold costs, and facilitate the maintenance of the runner system has become a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is how to design a cold runner system integrated BMC injection mold structure with a simpler and more reasonable structural design, which can improve mold change efficiency, reduce mold cost, and facilitate the maintenance of the runner.

[0006] To achieve the above objectives, the present invention provides a cold runner system integrated BMC injection mold structure, including a fixed mold part structure and a moving mold part structure, wherein a workpiece forming cavity is provided between the fixed mold part structure and the moving mold part structure for forming workpieces; characterized in that; it also includes a runner part structure detachably mounted on the fixed mold part structure; the runner part structure has a feed insert rod, on which an axially penetrating feed hole is provided, and the feed insert rod is axially slidably fitted into a mating hole in the fixed mold part structure, such that the inner end of the feed hole on the feed insert rod communicates with the workpiece forming cavity between the fixed mold part structure and the moving mold part structure; the runner part structure also has a sprue sleeve for docking with the injection molding machine nozzle, and the runner part structure also has a runner, which connects the inner end of the sprue sleeve and the feed hole on the feed insert rod.

[0007] Thus, when the aforementioned cold runner system integrated with the BMC injection mold structure is in operation, the runner section remains mounted on the injection molding machine, and also includes a sprue sleeve for docking with the injection molding machine nozzle. Since the runner section is detachably mounted on the fixed mold section, when mold replacement is required, the fixed and moving mold sections are directly disassembled, and a new mold is installed. The feed insert rod on the runner section fits into the mating hole in the fixed mold section, and the inner end of the feed hole on the feed insert rod connects to the workpiece forming cavity between the fixed and moving mold sections, completing the mold replacement. This structure has the following characteristics: 1. Because the runner section does not need to be replaced, compared to traditional mold replacement which requires waiting for the plastic in the runner to completely cool, this technology reduces the waiting time for the plastic in the runner to cool, shortens the mold replacement time, improves mold replacement efficiency, and reduces injection molding machine downtime, thus improving injection molding efficiency. 2. The runner system is fixed on the injection molding machine, eliminating the need for repeated development and design of the runner system during mold making. Subsequent mold making only requires designing the lower part of the mold, thus saving costs. 3. Finally, it also reduces mold maintenance costs, making it easier to maintain the runner system structure separately.

[0008] Furthermore, a precision guide block is provided at the inner end of the mating hole in the fixed mold part structure, and a guide mating hole is provided on the precision guide block, so that the mating protrusion at the inner end of the feed insert rod can be correspondingly mated in the guide mating hole.

[0009] In this way, by setting a precision guide block on the fixed mold part structure, after the feeding insert rod is engaged with the fixed mold part structure, the matching protrusion of the inner end of the feeding insert rod is matched in the guide matching hole of the precision guide block, which can make the positioning of the feeding insert rod more accurate and the installation positioning more precise.

[0010] As an optimization, the flow channel structure includes a lower flow channel plate, on which the feed insert rod is fixedly installed. A water jacket insert rod is also fixedly installed on the lower flow channel plate, such that the lower end of the feed insert rod extends into and fits into the inner hole of the water jacket insert rod, and the water jacket insert rod is axially slidably fitted into the mating hole of the fixed mold structure; a water pipe arrangement groove is provided on the inner circumferential surface of the water jacket insert rod for arranging cooling water pipes, and the cooling water pipes can be in contact with the outer circumferential surface of the feed insert rod inside the water jacket insert rod for cooling.

[0011] In this way, by setting up water jacket insert rods and cooling water pipes, the feed insert rods can be cooled better, reducing the temperature transfer to the fixed mold structure, resulting in a lower temperature in the fixed mold structure, reducing mold change waiting time, and improving efficiency.

[0012] Furthermore, a positioning ring with an annular structure is provided between the inner circumferential surface of the far end of the water jacket insert rod and the outer circumferential surface of the far end of the feed insert rod; a sealing ring mounting groove is provided on the outer circumferential surface of the far end of the feed insert rod and a sealing ring is installed thereon, so that the outer circumferential surface of the sealing ring is in contact with the inner circumferential surface of the far end of the water jacket insert rod for sealing.

[0013] In this way, by setting a positioning ring and a sealing ring, the inner circumference of the far end of the water jacket insert rod and the feed insert rod can be better installed, positioned and sealed.

[0014] As an optimization, the flow channel structure also includes an upper flow channel plate, which is attached to the upper surface of the lower flow channel plate; the flow channel includes a main flow channel disposed between the upper flow channel plate and the lower flow channel plate, the outer end of the main flow channel is connected to the inner end of the gate sleeve, and a branch flow channel is also connected to the inner end of the main flow channel, the far end of the branch flow channel is connected to the feed hole on the feed insert rod.

[0015] In this way, by setting up upper and lower runner plates, it becomes easier to machine the main runner and branch runners between their opposing surfaces. Setting up main and branch runners also makes it easier to connect the sprue bushing to the feed hole on the feed insert rod.

[0016] As an optimization, the feed hole includes a large-diameter section at the inner end and a small-diameter section at the far end, and also includes a tapered hole section connecting the large-diameter section and the small-diameter section, such that the large end of the tapered hole connects with the large-diameter section and the small end of the tapered hole connects with the small-diameter section; a cutter bar is provided in the large-diameter section of the feed hole, and the diameter of the far end of the cutter bar matches the diameter of the small end of the tapered hole; the other end of the cutter bar passes through a through hole in the upper flow channel plate and extends to the outside to form a cutter bar mounting section, and the cutter bar can move axially inward and cooperate in the tapered hole section to cut the material in the feed hole.

[0017] In this way, by setting up a cutting rod, the inward movement of the cutting rod can work in conjunction with the small-diameter section and the tapered section of the feed hole to cut the plastic. When it is necessary to change the mold, the plastic in the feed hole is cut off and the feed hole is blocked. The whole design is more reasonable and more convenient and practical.

[0018] Furthermore, a cutter sleeve is provided on the fixed mold part structure, and the cutter hole of the cutter sleeve is connected to the far end of the small diameter section of the feed hole on the feed insert rod.

[0019] This design of the cutter sleeve allows for better coordination with the cutter bar and the feed insert bar.

[0020] As an optimization, square iron pads are provided on both sides of the feed channel plate, and a fixed base plate is provided on the upper side of the two square iron pads; a strong pull plate, a cutter base plate, and a cutter panel are provided on the inner side of the fixed base plate between the two square iron pads, and the cutter rod mounting section is fixedly mounted on the cutter base plate and the cutter panel; a strong pull rod is installed between the strong pull plate and the cutter base plate, and the distal end of the strong pull rod extends to the outside through the clearance hole of the fixed base plate; a strong pull block extending horizontally outward is also connected to the inner end of the strong pull rod, and the outer end of the strong pull block is vertically movable and fitted into the clearance notch of the square iron pad; the strong pull rod moves outward and can drive the strong pull plate, the cutter base plate, the cutter panel, and the cutter rod to move, and the strong pull block can be supported against the inner surface of the fixed base plate, and the upper flow channel plate and the lower flow channel plate are separated.

[0021] In this way, when the above structure is in operation, the inward movement of the strong pull rod can push the cutter base plate, cutter panel, and cutter rod to move, enabling the cutter rod to complete the cutting of the plastic. The outward movement of the strong pull rod can drive the strong pull plate, cutter base plate, cutter panel, and cutter rod to move, causing the strong pull plate to abut against the fixed base plate. This causes the square iron pad and upper flow channel plate mounted on the fixed base plate to move, and separates the upper and lower flow channel plates, thus making it easier to maintain the flow channel.

[0022] As an optimization, the strong pull block includes an outer section of the strong pull block disposed on the outer side of the strong pull plate and the cutter base plate. The outer section of the strong pull block is connected to the side of the cutter base plate by screws. A connecting section protruding inward is provided on the upper side of the inner end of the outer section of the strong pull block, and the connecting section is fitted into a mating groove on the lower side of the strong pull plate. A strong pull rod through hole is provided at the inner end of the connecting section, and the strong pull rod fits into the strong pull rod through hole.

[0023] In this way, the structural design of the strong pull block is simpler and more reasonable, and it can better cooperate with the strong pull plate and the cutter base plate, making the cooperation more stable and reliable.

[0024] As an optimization, a cutter fixing insert is provided on the inner side of the upper flow channel plate, and a cutter bar through hole is provided on the cutter fixing insert for the cutter bar to pass through; and a sealing ring is provided between the outer end of the cutter bar through hole of the cutter fixing insert and the cutter bar.

[0025] By setting up a cutter fixing insert and a sealing ring, the cutter bar can operate more stably and reliably.

[0026] As an optimization, the feed insert rod includes a feed insert rod head at the outer end, and the outer end face of the feed insert rod head is provided with a feed notch and communicates with the far end of the diversion channel; a feed fine adjustment pin is also provided with a threaded fit on the fixed base plate, and the inner end of the feed fine adjustment pin passes through the strong pull plate, the cutter base plate, the cutter panel and the upper flow channel plate, and then fits into the feed notch in the feed insert rod head.

[0027] In this way, by setting the feed fine adjustment needle, the feed amount at the feed notch position can be adjusted by adjusting the feed fine adjustment needle.

[0028] As an optimization, first guide posts are provided at the four corners of the cutter base plate and the cutter panel, and first guide sleeves are provided on the upper flow channel plate corresponding to each of the first guide posts, so that the first guide posts are fitted into the first guide sleeves.

[0029] This makes the movement of the cutter base plate and cutter face plate more stable and reliable.

[0030] As an optimization, four second guide pillars are arranged in a rectangular pattern on the lower runner plate, and a second guide sleeve is provided on the fixed mold part structure, corresponding to each of the four second guide pillars, so that the second guide pillars fit into the second guide sleeve.

[0031] This makes the fit between the flow channel structure and the fixed mold structure more reliable.

[0032] Furthermore, the fixed mold section structure includes a panel attached to the lower runner plate, a front mold square iron on each side below the panel, a front mold core-pulling plate between the two front mold square irons, a core rod on the front mold core-pulling plate, and a core rod such that the distal end of the core rod mates with a hole structure on the workpiece in the molding cavity; a core-pulling cylinder is provided at each end of the panel, and the piston rod end of the core-pulling cylinder is connected to the front mold core-pulling plate; and a notch is provided on the upper and lower runner plates at a position opposite to the core-pulling cylinder for arranging the core-pulling cylinder.

[0033] In this way, the core-pulling cylinder can better drive the core-pulling plate and core rod of the mold to move and complete the core-pulling process.

[0034] Furthermore, a locking module is provided between plate A of the fixed mold part structure and plate B of the moving mold part structure.

[0035] Furthermore, four rectangularly distributed third guide pillars are provided on plate A, and the third guide pillars are fitted into the guide hole structure of the front mold core-pulling plate.

[0036] Furthermore, thermocouples are installed on both plate A and plate B.

[0037] Furthermore, the moving mold part structure also includes a rear mold support plate, a rear mold square iron, a rear mold ejector plate, a rear mold ejector base plate, and a moving mold base plate, as well as springs and ejector pins.

[0038] In summary, the above-mentioned cold runner system integrated BMC injection mold structure has the advantages of simpler and more reasonable structural design, improved mold change efficiency, reduced mold cost, and easier maintenance of the runner. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the cold runner system integrated BMC injection mold structure in a specific embodiment of the present invention.

[0040] Figure 2 yes Figure 1 A schematic diagram after rotating by one angle.

[0041] Figure 3 yes Figure 1 A cross-sectional view.

[0042] Figure 4 yes Figure 3 A magnified view of position A in the diagram.

[0043] Figure 5 yes Figure 1 A schematic diagram of the flow channel structure.

[0044] Figure 6 yes Figure 5 A schematic diagram after rotating by one angle.

[0045] Figure 7 yes Figure 5 A diagram showing the result after rotating to another angle.

[0046] Figure 8 yes Figure 1 A schematic diagram with some structures omitted.

[0047] Figure 9 yes Figure 8 A magnified view of position B in the diagram.

[0048] Figure 10 yes Figure 1 A schematic diagram showing the assembly of the fixed mold section and the moving mold section.

[0049] Figure 11 yes Figure 1 A schematic diagram of the upper flow channel plate.

[0050] Figure 12 yes Figure 1 A schematic diagram of the lower flow channel plate. Detailed Implementation

[0051] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the present invention and for 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 manner. Therefore, they should not be construed as limitations on the present invention. Terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] like Figures 1 to 12 As shown, a cold runner system integrated BMC injection mold structure includes a fixed mold section 1 and a moving mold section 2, with a workpiece forming cavity between the fixed mold section and the moving mold section for forming a workpiece 3; it also includes a runner section 4 detachably mounted on the fixed mold section; the runner section has a feed insert 5, on which an axially penetrating feed hole is provided, and the feed insert slidably fits into a mating hole in the fixed mold section, such that the inner end of the feed hole on the feed insert is connected to the workpiece forming cavity between the fixed mold section and the moving mold section; the runner section also has a sprue sleeve 6 for docking with the injection molding machine nozzle, and a runner 7 connecting the inner end of the sprue sleeve and the feed hole on the feed insert 7.

[0053] Thus, when the aforementioned cold runner system integrated with the BMC injection mold structure is in operation, the runner section remains mounted on the injection molding machine, and also includes a sprue sleeve for docking with the injection molding machine nozzle. Since the runner section is detachably mounted on the fixed mold section, when mold replacement is required, the fixed and moving mold sections are directly disassembled, and a new mold is installed. The feed insert rod on the runner section fits into the mating hole in the fixed mold section, and the inner end of the feed hole on the feed insert rod connects to the workpiece forming cavity between the fixed and moving mold sections, completing the mold replacement. This structure has the following characteristics: 1. Because the runner section does not need to be replaced, compared to traditional mold replacement which requires waiting for the plastic in the runner to completely cool, this technology reduces the waiting time for the plastic in the runner to cool, shortens the mold replacement time, improves mold replacement efficiency, and reduces injection molding machine downtime, thus improving injection molding efficiency. 2. The runner system is fixed on the injection molding machine, eliminating the need for repeated development and design of the runner system during mold making. Subsequent mold making only requires designing the lower part of the mold, thus saving costs. 3. Finally, it also reduces mold maintenance costs, making it easier to maintain the runner system structure separately.

[0054] Furthermore, a precision guide block 8 is provided at the inner end of the mating hole in the fixed mold part structure, and a guide mating hole is provided on the precision guide block, so that the mating protrusion at the inner end of the feed insert rod can be correspondingly mated in the guide mating hole.

[0055] In this way, by setting a precision guide block on the fixed mold part structure, after the feeding insert rod is engaged with the fixed mold part structure, the matching protrusion of the inner end of the feeding insert rod is matched in the guide matching hole of the precision guide block, which can make the positioning of the feeding insert rod more accurate and the installation positioning more precise.

[0056] In this specific embodiment, the flow channel structure includes a lower flow channel plate 9, on which the feed insert rod is fixedly installed. A water jacket insert rod 10 is also fixedly installed on the lower flow channel plate, such that the lower end of the feed insert rod extends into and fits into the inner hole of the water jacket insert rod, and the water jacket insert rod is axially slidably fitted into the fitting hole of the fixed mold structure. A water pipe arrangement groove is provided on the inner circumferential surface of the water jacket insert rod for arranging cooling water pipes 11, and the cooling water pipes can be in contact with the outer circumferential surface of the feed insert rod inside the water jacket insert rod for cooling.

[0057] In this way, by setting up water jacket insert rods and cooling water pipes, the feed insert rods can be cooled better, reducing the temperature transfer to the fixed mold structure, resulting in a lower temperature in the fixed mold structure, reducing mold change waiting time, and improving efficiency.

[0058] Furthermore, a positioning ring 12 with an annular structure is provided between the inner circumferential surface of the far end of the water jacket insert rod and the outer circumferential surface of the far end of the feed insert rod; a sealing ring mounting groove is provided on the outer circumferential surface of the far end of the feed insert rod and a sealing ring 13 is installed thereon, so that the outer circumferential surface of the sealing ring is in contact with the inner circumferential surface of the far end of the water jacket insert rod for sealing.

[0059] In this way, by setting a positioning ring and a sealing ring, the inner circumference of the far end of the water jacket insert rod and the feed insert rod can be better installed, positioned and sealed.

[0060] In this specific embodiment, the flow channel structure also includes an upper flow channel plate 14, which is attached to the upper surface of the lower flow channel plate; the flow channel includes a main flow channel 15 disposed between the upper flow channel plate and the lower flow channel plate, the outer end of the main flow channel is connected to the inner end of the gate sleeve, and a branch flow channel 16 is also connected to the inner end of the main flow channel, the far end of the branch flow channel is connected to the feed hole on the feed insert rod.

[0061] In this way, by setting up upper and lower runner plates, it becomes easier to machine the main runner and branch runners between their opposing surfaces. Setting up main and branch runners also makes it easier to connect the sprue bushing to the feed hole on the feed insert rod.

[0062] In this specific embodiment, the feed hole includes a large-diameter section at the inner end and a small-diameter section at the far end. It also includes a tapered hole section connecting the large-diameter section and the small-diameter section, such that the large end of the tapered hole connects to the large-diameter section and the small end of the tapered hole connects to the small-diameter section. A cutter bar 17 is provided in the large-diameter section of the feed hole, and the diameter of the far end of the cutter bar matches the diameter of the small end of the tapered hole. The other end of the cutter bar passes through a through hole on the upper flow channel plate and extends to the outside to form a cutter bar mounting section 18. The cutter bar can move axially inward and cooperate in the tapered hole section to cut the material in the feed hole.

[0063] In this way, by setting up a cutting rod, the inward movement of the cutting rod can work in conjunction with the small-diameter section and the tapered section of the feed hole to cut the plastic. When it is necessary to change the mold, the plastic in the feed hole is cut off and the feed hole is blocked. The whole design is more reasonable and more convenient and practical.

[0064] Furthermore, a cutter sleeve 19 is provided on the fixed mold part structure, and the cutter hole of the cutter sleeve is connected to the far end of the small diameter section of the feed hole on the feed insert rod.

[0065] This design of the cutter sleeve allows for better coordination with the cutter bar and the feed insert bar.

[0066] In this specific embodiment, square iron pads 20 are provided on both sides of the feed channel plate, and a fixed base plate 21 is provided on the upper side of the two square iron pads; a strong pull plate 22, a cutter base plate 23, and a cutter panel 24 are provided on the inner side of the fixed base plate between the two square iron pads, and the cutter rod mounting section is fixedly mounted on the cutter base plate and the cutter panel; a strong pull rod 25 is installed between the strong pull plate and the cutter base plate, and the far end of the strong pull rod passes through the clearance through hole of the fixed base plate to the outside; a strong pull block 26 extending horizontally outward is also connected to the inner end of the strong pull rod, and the outer end of the strong pull block is vertically movable and fitted in the clearance notch 27 of the square iron pad; the strong pull rod moves outward and can drive the strong pull plate, the cutter base plate, the cutter panel, and the cutter rod to move, and the strong pull block can be supported against the inner surface of the fixed base plate, and the upper flow channel plate and the lower flow channel plate are separated.

[0067] In this way, when the above structure is in operation, the inward movement of the strong pull rod can push the cutter base plate, cutter panel, and cutter rod to move, enabling the cutter rod to complete the cutting of the plastic. The outward movement of the strong pull rod can drive the strong pull plate, cutter base plate, cutter panel, and cutter rod to move, causing the strong pull plate to abut against the fixed base plate. This causes the square iron pad and upper flow channel plate mounted on the fixed base plate to move, and separates the upper and lower flow channel plates, thus making it easier to maintain the flow channel.

[0068] In this specific embodiment, the strong pull block includes an outer section 28 of the strong pull block disposed on the outer side of the strong pull plate and the cutter base plate. The outer section of the strong pull block is connected to the side of the cutter base plate by screws. A connecting section 29 protruding inward is provided on the upper side of the inner end of the outer section of the strong pull block. The connecting section is fitted into a mating groove on the lower side of the strong pull plate. A strong pull rod through hole is provided at the inner end of the connecting section, so that the strong pull rod fits into the strong pull rod through hole.

[0069] In this way, the structural design of the strong pull block is simpler and more reasonable, and it can better cooperate with the strong pull plate and the cutter base plate, making the cooperation more stable and reliable.

[0070] In this specific embodiment, a cutter fixing insert 30 is provided on the inner side of the upper flow channel plate, and a cutter rod through hole is provided on the cutter fixing insert for the cutter rod to pass through; and a sealing ring 31 is provided between the outer end of the cutter rod through hole of the cutter fixing insert and the cutter rod.

[0071] By setting up a cutter fixing insert and a sealing ring, the cutter bar can operate more stably and reliably.

[0072] In this specific embodiment, the feed insert rod includes a feed insert rod head 32 at the outer end, and a feed notch 33 is provided on the outer end face of the feed insert rod head and communicates with the far end of the diversion channel; a feed fine adjustment pin 34 is also threadedly provided on the fixed base plate, and the inner end of the feed fine adjustment pin passes through the strong pull plate, the cutter base plate, the cutter panel and the upper flow channel plate, and is correspondingly fitted in the feed notch of the feed insert rod head.

[0073] In this way, by setting the feed fine adjustment needle, the feed amount at the feed notch position can be adjusted by adjusting the feed fine adjustment needle.

[0074] In this specific embodiment, first guide posts 35 are provided at the four corner positions of the cutter base plate and the cutter panel, and first guide sleeves are provided on the upper flow channel plate corresponding to the first guide posts, such that the first guide posts are fitted into the first guide sleeves.

[0075] This makes the movement of the cutter base plate and cutter face plate more stable and reliable.

[0076] In this specific embodiment, four second guide posts 36 are arranged in a rectangular pattern on the lower runner plate, and a second guide sleeve 37 is provided on the fixed mold part structure, corresponding to each of the four second guide posts, so that the second guide posts are fitted inside the second guide sleeve.

[0077] This makes the fit between the flow channel structure and the fixed mold structure more reliable.

[0078] Furthermore, the fixed mold part structure includes a panel 38 attached to the lower runner plate, a front mold square iron 39 on each side below the panel, a front mold core-pulling plate 40 between the two front mold square irons, a core rod on the front mold core-pulling plate, and a core rod such that the distal end of the core rod mates with a hole structure on the workpiece in the molding cavity; a core-pulling cylinder 41 is provided at each end of the panel, and the piston rod end of the core-pulling cylinder is connected to the front mold core-pulling plate; and a notch is provided on the upper runner plate and the lower runner plate at a position opposite to the core-pulling cylinder for arranging the core-pulling cylinder.

[0079] In this way, the core-pulling cylinder can better drive the core-pulling plate and core rod of the mold to move and complete the core-pulling process.

[0080] Furthermore, a locking module is provided between the A plate 42 of the fixed mold part structure and the B plate 43 of the moving mold part structure.

[0081] Furthermore, four rectangularly distributed third guide pillars are provided on plate A, and the third guide pillars are fitted into the guide hole structure of the front mold core-pulling plate.

[0082] Furthermore, thermocouples 44 are installed on both plate A and plate B.

[0083] Furthermore, the moving mold part structure also includes a rear mold support plate 45, a rear mold square iron 46, a rear mold ejector plate 47, a rear mold ejector base plate 48, and a moving mold base plate 49, as well as a spring 50 and an ejector pin.

[0084] In summary, the above-mentioned cold runner system integrated BMC injection mold structure has the advantages of simpler and more reasonable structural design, improved mold change efficiency, reduced mold cost, and easier maintenance of the runner.

[0085] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A cold runner system integrated BMC injection mold structure, comprising a fixed mold section and a moving mold section, wherein a workpiece forming cavity is provided between the fixed mold section and the moving mold section for forming workpieces; characterized in that... ； It also includes a detachable runner structure mounted on the fixed mold section structure; the runner structure has a feed insert rod with an axially penetrating feed hole, and the feed insert rod is axially slidably fitted into a mating hole in the fixed mold section structure, so that the inner end of the feed hole on the feed insert rod is connected to the workpiece forming cavity between the fixed mold section structure and the moving mold section structure; the runner structure also has a sprue bushing for docking with the injection molding machine nozzle, and the runner structure also has a runner that connects the inner end of the sprue bushing and the feed hole on the feed insert rod.

2. The cold runner system integrated BMC injection mold structure as described in claim 1, characterized in that; The flow channel structure includes a lower flow channel plate, on which the feed insert rod is fixedly installed. A water jacket insert rod is also fixedly installed on the lower flow channel plate, such that the lower end of the feed insert rod extends into and fits into the inner hole of the water jacket insert rod, and the water jacket insert rod is axially slidably fitted into the mating hole of the fixed mold structure. A water pipe arrangement groove is provided on the inner circumferential surface of the water jacket insert rod for arranging cooling water pipes, and the cooling water pipes can be in contact with the outer circumferential surface of the feed insert rod inside the water jacket insert rod for cooling.

3. The BMC injection mold structure for a cold runner system integration as described in claim 2, characterized in that; The flow channel structure also includes an upper flow channel plate, which is attached to the upper surface of the lower flow channel plate. The flow channel includes a main flow channel between the upper flow channel plate and the lower flow channel plate. The outer end of the main flow channel is connected to the inner end of the gate sleeve. A branch flow channel is also connected to the inner end of the main flow channel. The far end of the branch flow channel is connected to the feed hole on the feed insert rod.

4. The BMC injection mold structure for a cold runner system integration as described in claim 3, characterized in that; The feed hole includes a large-diameter section at the inner end and a small-diameter section at the outer end. It also includes a tapered hole section connecting the large-diameter section and the small-diameter section, such that the large end of the tapered hole connects to the large-diameter section and the small end of the tapered hole connects to the small-diameter section. A cutter bar is provided in the large-diameter section of the feed hole, and the diameter of the far end of the cutter bar matches the diameter of the small end of the tapered hole. The other end of the cutter bar passes through a through hole on the upper flow channel plate and extends to the outside to form a cutter bar mounting section. The cutter bar can move axially inward and fit into the tapered hole section to cut the material in the feed hole.

5. The BMC injection mold structure for a cold runner system integration as described in claim 4, characterized in that; Square iron pads are provided on both sides of the feed channel plate, and a fixed base plate is provided on the upper side of the two square iron pads. A strong pull plate, a cutter base plate, and a cutter panel are provided on the inner side of the fixed base plate between the two square iron pads, and the cutter rod mounting section is fixedly installed on the cutter base plate and the cutter panel. A strong pull rod is installed between the strong pull plate and the cutter base plate, and the far end of the strong pull rod passes through the clearance through hole of the fixed base plate to the outside. A strong pull block extending horizontally outward is also connected to the inner end of the strong pull rod, and the outer end of the strong pull block is vertically movable and fitted in the clearance notch of the square iron pad. The strong pull rod moves outward and can drive the strong pull plate, the cutter base plate, the cutter panel, and the cutter rod to move, and the strong pull block can be supported against the inner surface of the fixed base plate, and the upper flow channel plate and the lower flow channel plate are separated.

6. The BMC injection mold structure for a cold runner system integration as described in claim 5, characterized in that; The strong pull block includes an outer section of the strong pull block set on the outer side of the strong pull plate and the cutter base plate. The outer section of the strong pull block is set on the side of the cutter base plate by screws. A connecting section protruding inward is provided on the upper side of the inner end of the outer section of the strong pulling block, and the connecting section is fitted into the mating groove on the lower side of the strong pulling plate. A strong pulling rod through hole is provided at the inner end of the connecting section, and the strong pulling rod fits into the strong pulling rod through hole.

7. The BMC injection mold structure for a cold runner system integration as described in claim 5, characterized in that; A cutter fixing insert is provided on the inner side of the upper flow channel plate, and a cutter bar through hole is provided on the cutter fixing insert for the cutter bar to pass through; and a sealing ring is provided between the outer end of the cutter bar through hole of the cutter fixing insert and the cutter bar.

8. The BMC injection mold structure for a cold runner system integration as described in claim 5, characterized in that; The feed insert rod includes a feed insert rod head at the outer end, and the outer end face of the feed insert rod head is provided with a feed notch and communicates with the far end of the diversion channel; a feed fine adjustment pin is also provided with a threaded fit on the fixed base plate, and the inner end of the feed fine adjustment pin passes through the strong pull plate, the cutter base plate, the cutter panel and the upper flow channel plate, and is correspondingly fitted in the feed notch of the feed insert rod head.

9. The BMC injection mold structure for a cold runner system integration as described in claim 5, characterized in that; First guide posts are provided at the four corners of the cutter base plate and the cutter panel. First guide sleeves are provided on the upper flow channel plate, each corresponding to a first guide post, such that the first guide posts are fitted into the first guide sleeves.

10. The BMC injection mold structure for a cold runner system integration as described in claim 5, characterized in that; Four second guide pillars are arranged in a rectangular pattern on the lower runner plate. On the fixed mold part structure, a second guide sleeve is provided corresponding to each of the four second guide pillars, so that the second guide pillars fit into the second guide sleeve.

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