Deep root chain chain head and its forming die

Abstract

This invention discloses a deep-rooted, segmented, explosion-proof zipper head and its forming mold. A deep-rooted connecting post is provided between the upper and lower base plates of the zipper head. This connecting post consists of upper and lower connecting sections, with only the upper connecting section featuring a frustum-shaped reverse-sloping structure. Its cross-section continuously and uniformly increases from the top near the upper base plate to the bottom, forming an annular step at the connection point between the bottom and the lower connecting section. The forming mold includes upper and lower mold assemblies and a sheet-like detachable mold core. The upper mold core mounting groove is naturally formed by the intervals between adjacent upper mold forming protrusions. Forming portions extending along the thickness are provided on both sides of the mold core, forming a zipper head forming cavity with the upper and lower mold forming grooves. This invention achieves axial anti-detachment of the zipper pull through the reverse-sloping structure and annular step, improving the bending and tensile strength of the connecting post. The differentiated segmented structure balances anti-detachment performance and forming feasibility, avoiding stress concentration defects in the internal cavity caused by full-section reverse sloping, and the streamlined segmented structure reduces chain tooth jamming.

Description

Technical Field

[0001] This invention relates to the field of zipper manufacturing technology, and in particular to a deep-root split-chain explosion-proof zipper head and its forming mold. Background Technology

[0002] Zippers, as a common connector, are widely used in clothing, bags, outdoor products, and other fields. The zipper pull is the core component that enables the zipper teeth to engage and disengage. In the injection molding production of zipper pulls, the deep root of the mold core in traditional molds is usually designed as a flat structure, resulting in a flat deep root for the molded zipper pull. When the zipper pull is assembled with the zipper belt, the flat deep root cannot effectively and continuously compress and limit the zipper teeth. After the zipper is subjected to lateral pulling force or long-term wear, the zipper teeth are prone to coming undone, causing the zipper to burst, which seriously affects the normal use of the zipper and product quality.

[0003] To address the issue of zipper bursting, various improvement solutions exist in existing technologies. For example, Chinese utility model patent CN212729030U discloses an explosion-proof zipper pull and its zipper. Its core improvement involves setting upper and lower clamping platforms, centered horizontally and extending backward, on opposite surfaces of the upper and lower base plates of the zipper pull. By setting the backward extension length of the clamping platforms to be greater than the tooth pitch, combined with the lateral limiting of the zipper pull's side edge, omnidirectional constraints are formed on the meshed zipper teeth, thereby improving the stability of the zipper tooth engagement. However, this solution adopts an "additional structure to finished product" design approach, requiring a redesign of the overall zipper pull structure and the creation of a new set of molds. This results in high modification costs, a narrow range of applicability, and the explosion-proof function relies entirely on the newly added clamping platform structure. If the clamping platform experiences dimensional deviations or wear, the explosion-proof effect will significantly decrease.

[0004] For example, Chinese invention patent application CN112773055A discloses a waterproof zipper pull and a waterproof zipper. It solves the problem of waterproof failure when the zipper pull deviates from its sealing limit by providing a tight-fitting surface, front and rear guide slopes, and an extended tight-fitting surface at the front extension of the upper and lower wing plates of the zipper pull, thereby extending the tight-fitting stroke with the zipper front stop. However, all improvements in this solution revolve around the sealing and guiding functions of the waterproof zipper, failing to address the problem of chain bursting in ordinary zippers, and completely neglecting the structural design of the zipper pull injection molding mold. Therefore, it cannot fundamentally solve the industry-wide problem of the deep-rooted surface failing to hold the zipper teeth in place.

[0005] In summary, existing explosion-proof zipper pull solutions all suffer from drawbacks such as high modification costs, poor adaptability, and susceptibility to dimensional deviations and wear. Furthermore, none of them address the root cause of zipper bursting issues in the mold forming process. Therefore, there is an urgent need to develop a mold structure capable of producing zipper pulls with stable explosion-proof performance at low cost and high efficiency. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a deep-rooted split-chain explosion-proof zipper head and its forming mold, which can achieve axial anti-detachment of the pull tab through the anti-slip structure and the ring step, and improve the bending and tensile strength of the connecting column; the differentiated segmented structure takes into account both anti-detachment performance and forming feasibility, avoids the internal cavity stress concentration defect caused by the full-section anti-slip, and reduces chain tooth jamming when combined with the streamlined segmented structure.

[0007] To address the aforementioned technical problems, the first aspect of this invention discloses a deep-rooted, explosion-proof zipper pull, comprising a zipper pull body. The zipper pull body has an upper substrate and a lower substrate arranged opposite to each other. A deep-rooted connecting post is provided between the upper substrate and the lower substrate. The deep-rooted connecting post is composed of an upper connecting section and a lower connecting section. The upper connecting section is located on the side closer to the upper substrate, and the lower connecting section is located on the side closer to the lower substrate. Only the upper connecting section is provided with a frustum-shaped reverse slope structure. In the direction perpendicular to the upper substrate, the overall cross-sectional dimension of the upper connecting section continuously and uniformly increases from the top near the upper substrate to the bottom near the lower connecting section, forming a frustum-shaped structure that is narrow at the top and wide at the bottom. The cross-sectional dimension of the bottom of the upper connecting section is larger than the cross-sectional dimension of the top of the lower connecting section, forming an annular step at the connection between the two.

[0008] As an optional implementation, in the first aspect of the present invention, the upper connecting section is divided into an upper front connecting part and an upper rear connecting part along the front-rear direction of the zipper body, and the upper front connecting part and the upper rear connecting part are naturally and smoothly transitioned; the front end of the upper front connecting part is flat and gradually tapers at a preset angle along the head direction of the zipper body.

[0009] As another optional implementation, in the first aspect of the invention, the front end of the upper rear connecting part is smoothly connected to the rear end of the upper front connecting part, the middle part of the upper rear connecting part is tightened inward, and the rear end of the upper rear connecting part has a gradually converging pointed structure, with the tip of the pointed structure pointing towards the rear side of the zipper body.

[0010] As another optional implementation, in the first aspect of the present invention, the left and right sides of the upper connecting segment are symmetrically arranged reverse slope slopes, and the reverse slope slopes form a preset angle of 70°-80° with the upper surface of the upper substrate.

[0011] As another optional implementation, in the first aspect of the present invention, the lower connecting section is divided into a lower front section, a lower middle section and a lower rear section in sequence along the front-rear direction of the zipper body, with a natural and smooth transition between the three sections; the front end of the lower front section is flat and gradually tapers at a preset angle along the head direction of the zipper body.

[0012] As another optional implementation, in the first aspect of the present invention, the lower middle section is an inwardly tightening transition section, the width of which is less than the maximum width of the lower front section and greater than the maximum width of the lower rear section; the lower rear section has a gradually converging pointed structure, the tip of which faces the rear side of the slider body.

[0013] As another optional implementation, in the first aspect of the present invention, a guide limiting protrusion is provided on the upper surface of the lower substrate, the front end of the guide limiting protrusion is connected to the bottom of the lower middle section and the bottom of the lower rear section of the lower connecting segment; the outer contour of the guide limiting protrusion is divided into two segments: the width of the front segment is less than or equal to the maximum width of the lower middle section and greater than the maximum width of the lower rear section; the width of the rear segment gradually decreases from the connection point of the two contours to the rear end; the connection point of the two contours is located directly below the rear end of the lower connecting segment.

[0014] As another optional implementation, in the first aspect of the present invention, the guide limiting protrusion and the lower connecting section are integrally formed.

[0015] The second aspect of the present invention discloses a mold for forming the explosion-proof zipper head described in the first aspect of the present invention, comprising an upper mold assembly, a lower mold assembly, and a mold core; The lower mold assembly has a lower mold groove, and the bottom of the lower mold groove has a lower mold core mounting groove; a lower mold side wall forming groove is formed on each of the two opposite side walls of the lower mold core mounting groove; a lower mold top surface forming groove is formed on the bottom surface of the lower mold groove directly adjacent to each lower mold side wall forming groove; the lower mold side wall forming groove and the lower mold top surface forming groove on the same side are connected, and the grooves on both sides of the lower mold core mounting groove together form a lower mold forming groove corresponding to a zipper head. The lower surface of the upper mold assembly is provided with at least two upper mold forming protrusions. The gap between two adjacent upper mold forming protrusions naturally forms an upper mold core mounting groove. The upper mold core mounting groove is vertically aligned with the lower mold core mounting groove. An upper mold sidewall forming groove is formed on each of the two opposite sidewalls of the upper mold core mounting groove. An upper mold top surface forming groove is formed on the bottom surface of each upper mold forming protrusion directly adjacent to each upper mold sidewall forming groove. The upper mold sidewall forming groove and the upper mold top surface forming groove on the same side are connected. The grooves on both sides of the upper mold core mounting groove together form an upper mold forming groove corresponding to a zipper head. In the mold-closed state, the upper mold forming protrusion is inserted into the lower mold groove, the upper mold core mounting groove and the lower mold core mounting groove are vertically aligned, and the upper mold forming groove and the lower mold forming groove are vertically opposite each other; The mold core is a sheet-like component that can be detachably inserted into the upper mold core mounting groove and the lower mold core mounting groove that are aligned with each other. The two opposite sides of the mold core are respectively provided with forming parts, which are through the thickness direction of the mold core. After the mold is closed, the forming parts of the mold core, the lower mold forming groove and the upper mold forming groove together form the zipper head forming cavity. The lower mold forming groove and the upper mold forming groove are used to form the non-middle area of ​​the zipper head, and the forming part of the mold core is used to form the middle area of ​​the zipper head. The middle area includes at least the part where the deep root connecting post is formed.

[0016] As an optional implementation, in the second aspect of the present invention, the number of mold cores is at least one; the bottom of the lower mold groove is provided with a plurality of lower mold core mounting grooves spaced apart along the length direction, and the bottom of the upper mold forming protrusion is provided with a plurality of upper mold core mounting grooves; each upper mold core mounting groove and the corresponding lower mold core mounting groove are aligned vertically, and each mold core is inserted into a set of mutually aligned upper mold core mounting grooves and lower mold core mounting grooves; the through forming portions on both sides of each mold core cooperate with the upper mold forming grooves and lower mold forming grooves on the corresponding sides to form independent zipper head forming cavities.

[0017] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: Compared to existing technologies, the deep-rooted connecting post of the first aspect of this invention adopts a frustum-shaped reverse slope structure on the upper connecting section, with a narrow top and wide bottom. The symmetrical reverse slopes on both sides ensure uniform stress distribution after the pull tab is installed. Furthermore, the bottom end of the upper connecting section and the top end of the lower connecting section form an annular step, which allows for axial positioning of the pull tab after installation, effectively reducing the risk of accidental pull tab detachment. At the same time, the frustum structure with a narrow top and wide bottom increases the stress area at the root of the connecting post, improving its bending and tensile strength, and meeting the high-load requirements of explosion-proof zipper heads. The differentiated segmented reverse slope design, with the frustum-shaped reverse slope structure only on the upper connecting section and the lower connecting section using a conventional streamlined gradient structure, fully preserves the axial anti-detachment property of the pull tab. Under the premise of ensuring safety, the injection molding demolding resistance is significantly reduced, effectively avoiding demolding damage, material sticking to the cavity, and structural deformation defects that are prone to occur with full-section reverse draft, significantly improving product molding yield and dimensional consistency; both the upper and lower connecting sections adopt a streamlined design with front and rear segments, flattening and tapering at the front end and gradually converging into a pointed shape at the rear end, which can effectively guide the zipper teeth through the inner cavity of the zipper head and reduce the jamming phenomenon between the zipper teeth and the connecting post; together with the guide limiting protrusion on the lower base plate, it further guides and limits the zipper teeth, improving the smoothness of zipper pulling; the guide limiting protrusion and the lower connecting section adopt an integrated molding structure, eliminating the need for additional assembly processes, which not only improves the support strength of the connecting post root, but also simplifies the production process and reduces manufacturing costs.

[0018] In the second aspect of this invention, both the lower mold forming groove and the upper mold forming groove adopt a split structure with the side wall forming groove and the top surface forming groove connected. Combined with the forming parts that extend through both sides of the mold core, they can completely enclose and form a zipper head forming cavity with a reverse-sloping feature. This solves the problem that traditional molds are difficult to form reverse-sloping structures, which can easily lead to product defects, and ensures the forming accuracy of the deep-root connecting column. The upper mold core mounting groove is naturally formed by the gap between two adjacent upper mold forming protrusions, eliminating the need for additional groove processing at the bottom of the upper mold forming protrusions, reducing mold processing steps, and lowering processing difficulty and manufacturing costs. This design enhances the overall integrity and strength of the upper mold structure. The mold core adopts a sheet-like detachable structure, facilitating mold disassembly, replacement, and maintenance. The forming sections on both sides of each mold core can simultaneously participate in the forming of two independent zipper head forming cavities. Combined with the multi-cavity layout of multiple lower mold core mounting grooves and multiple upper mold forming protrusions, it significantly improves the efficiency of mass production. The upper mold forming protrusions are inserted into the lower mold grooves to achieve mold closing and positioning. Combined with the alignment structure of the upper and lower mold core mounting grooves, it can ensure the alignment accuracy of the upper and lower mold forming grooves, reduce product size deviations caused by mold closing misalignment, and improve the stability of product quality. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a deep-rooted, split-chain explosion-proof zipper head disclosed in an embodiment of the present invention; Figure 2 This is a front view structural diagram of a deep-rooted, split-chain explosion-proof zipper head disclosed in an embodiment of the present invention; Figure 3 This is another structural schematic diagram of a deep-rooted, split-chain explosion-proof zipper head disclosed in an embodiment of the present invention; Figure 4 This is a rear view structural diagram of a deep-rooted, split-chain explosion-proof zipper head disclosed in an embodiment of the present invention; Figure 5 This is a right-side structural schematic diagram of a deep-rooted, multi-chain explosion-proof zipper head disclosed in an embodiment of the present invention; Figure 6 This is a full sectional top view of a deep-rooted explosion-proof zipper head with a split chain, as disclosed in an embodiment of the present invention, with the upper connecting section cut laterally. Figure 7 This is a full sectional top view of a deep-rooted explosion-proof zipper head with a split chain, as disclosed in an embodiment of the present invention, with the lower connecting section cut laterally. Figure 8This is a schematic diagram of the upper mold assembly of a zipper head forming mold disclosed in an embodiment of the present invention; Figure 9 This is a schematic diagram of the lower mold assembly of a zipper head forming mold disclosed in an embodiment of the present invention; Figure 10 This is a schematic diagram of the core structure of a zipper head forming mold disclosed in an embodiment of the present invention; Figure 11 This is another schematic diagram of the core structure of a zipper head forming mold disclosed in an embodiment of the present invention. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1 See Figures 1-7 This invention discloses a deep-rooted explosion-proof zipper head, comprising a zipper head body, wherein the zipper head body has an upper base plate 1 and a lower base plate 2 arranged opposite to each other, and a deep-rooted connecting post is provided between the upper base plate 1 and the lower base plate 2; the deep-rooted connecting post is composed of an upper connecting section 3 and a lower connecting section 4, wherein the upper connecting section 3 is located on the side closer to the upper base plate 1, and the lower connecting section 4 is located on the side closer to the lower base plate 2; only the upper connecting section 3 is provided with a frustum-shaped reverse slope structure, and in the direction perpendicular to the upper base plate 1, the overall cross-sectional dimension of the upper connecting section 3 continuously and uniformly increases from the top near the upper base plate 1 to the bottom near the lower connecting section 4, forming a frustum-shaped structure that is narrow at the top and wide at the bottom; the cross-sectional dimension of the bottom end of the upper connecting section 3 is larger than the cross-sectional dimension of the top end of the lower connecting section 4, forming an annular step at the connection between the two.

[0023] In an optional embodiment, the upper connecting segment 3 is divided into an upper front connecting portion 31 and an upper rear connecting portion 32 along the front-rear direction of the zipper head body, with a smooth transition between the upper front connecting portion 31 and the upper rear connecting portion 32; the front end of the upper front connecting portion 31 is flat and gradually tapers towards the head of the zipper head body at a preset angle. In this embodiment, the preset angle is usually set according to the overall size of the zipper head body, the specifications of the zipper teeth, and the usage scenario, and generally ranges from 5° to 15° to ensure smooth passage of the zipper teeth.

[0024] In another optional embodiment, the front end of the upper rear connecting part 32 is smoothly connected to the rear end of the upper front connecting part 31, the middle part of the upper rear connecting part 32 is tightened inward, and the rear end of the upper rear connecting part 32 has a gradually converging pointed structure, with the tip of the pointed structure facing the rear side of the zipper body.

[0025] In another optional embodiment, the left and right sides of the upper connecting segment 3 are symmetrically arranged reverse-sloping surfaces, forming a preset angle of 70°-80° between the reverse-sloping surfaces and the upper surface of the upper substrate 1. In this embodiment, the preset angle of 70°-80° between the reverse-sloping surfaces and the upper surface of the upper substrate is a preferred angle range. This range can ensure the anti-detachment effect of the pull tab while taking into account the convenience of injection molding demolding. Those skilled in the art can adjust this angle within a reasonable range according to actual needs.

[0026] In another optional embodiment, the lower connecting segment 4 is divided into a lower front segment 41, a lower middle segment 42 and a lower rear segment 43 in sequence along the front-back direction of the zipper body, with a natural and smooth transition between the three segments; the front end of the lower front segment 41 is flat and gradually tapers at a preset angle along the head direction of the zipper body.

[0027] In another optional embodiment, the lower middle section 42 is an inwardly tapering transition section, the width of which is less than the maximum width of the lower front section 41 and greater than the maximum width of the lower rear section 43; the lower rear section 43 has a gradually converging pointed structure, the tip of which faces the rear side of the slider body.

[0028] In another optional embodiment, the upper surface of the lower substrate 2 is provided with a guide limiting protrusion 21, the front end of which is connected to the bottom of the lower middle section 42 and the bottom of the lower rear section 43 of the lower connecting segment 4; the outer contour of the guide limiting protrusion 21 is divided into two segments: the width of the front segment 211 is less than or equal to the maximum width of the lower middle section 42 and greater than the maximum width of the lower rear section 43; the width of the rear segment 212 gradually decreases from the connection point of the two segments to the rear end; the connection point of the two segments is located directly below the rear end of the lower connecting segment 4.

[0029] In another optional embodiment, the guide limiting protrusion 21 and the lower connecting section 4 are integrally formed.

[0030] In this embodiment, the upper and lower base plates correspond to the upper and lower wing plates in industry standards, and are two flat plate structures facing each other on the top and bottom of the zipper pull body. This embodiment does not describe other conventional structures of the zipper pull body in detail; those skilled in the art can make conventional settings based on existing technology.

[0031] Example 2 See Figures 8-11This invention discloses a mold for forming the explosion-proof zipper head of the deep-rooted split chain described in Embodiment 1, comprising an upper mold assembly 5, a lower mold assembly 6, and a mold core 7; The lower mold assembly 6 has a lower mold groove 61, and a lower mold core mounting groove 62 is formed at the bottom of the lower mold groove 61. A lower mold side wall forming groove 63 is formed on each of the two opposite side walls of the lower mold core mounting groove 62. A lower mold top surface forming groove 64 is formed on the bottom surface of the lower mold groove 61 that is directly adjacent to each lower mold side wall forming groove 63. The lower mold side wall forming groove 63 and the lower mold top surface forming groove 64 on the same side are connected. The grooves on both sides of the lower mold core mounting groove 62 are connected to form a lower mold forming groove corresponding to a zipper head. The lower surface of the upper mold assembly 5 is provided with at least two upper mold forming protrusions 51, and the gap between two adjacent upper mold forming protrusions 51 naturally forms an upper mold core mounting groove 52. The upper mold core mounting groove 52 is directly opposite to the lower mold core mounting groove 62. On the two opposite side walls of the upper mold core mounting groove 52, an upper mold side wall forming groove 53 is respectively opened. On the bottom surface of the upper mold forming protrusion 51 directly adjacent to each upper mold side wall forming groove 53, an upper mold top surface forming groove 54 is respectively opened. The upper mold side wall forming groove 53 and the upper mold top surface forming groove 54 on the same side are connected. The grooves on both sides of the upper mold core mounting groove 52 are connected to form an upper mold forming groove corresponding to a zipper head. In the mold-closed state, the upper mold forming protrusion 51 is inserted into the lower mold groove 61, the upper mold core mounting groove 52 is vertically aligned with the lower mold core mounting groove 62, and the upper mold forming groove is vertically aligned with the lower mold forming groove. The mold core 7 is a sheet-like component that can be detachably inserted into the upper mold core mounting groove 52 and the lower mold core mounting groove 62 that are aligned with each other. The two opposite sides of the mold core 7 are respectively provided with forming parts, which are through the thickness direction of the mold core 7. After the mold is closed, the forming parts of the mold core 7, the lower mold forming groove and the upper mold forming groove together form the zipper head forming cavity. The lower mold forming groove and the upper mold forming groove are used to form the non-middle area of ​​the zipper head, and the forming part of the mold core 7 is used to form the middle area of ​​the zipper head. The middle area includes at least the part for forming the deep root connecting post.

[0032] In an optional embodiment, the number of mold cores 7 is at least one; the bottom of the lower mold groove 61 is provided with a plurality of lower mold core mounting grooves 62 spaced apart along the length direction, and the bottom of the upper mold forming protrusion 51 is provided with a plurality of upper mold core mounting grooves 52; each upper mold core mounting groove 52 and the corresponding lower mold core mounting groove 62 are aligned vertically, and each mold core 7 is inserted into a set of mutually aligned upper mold core mounting grooves 52 and lower mold core mounting grooves 62; the through forming parts on both sides of each mold core 7 cooperate with the upper mold forming grooves and lower mold forming grooves on the corresponding sides to form an independent zipper head forming cavity.

[0033] In another optional embodiment, the molding part of the mold core 7 is provided with a molding cavity for molding a deep-root connecting post, the axial direction of which is parallel to the mold closing surface. The molding cavity includes a first molding part 71 corresponding to the upper connecting section 3 of the deep-root connecting post and a second molding part 72 corresponding to the lower connecting section 4 of the deep-root connecting post. The first molding part 71 is provided with an inverted frustum-shaped molding surface that matches the frustum-shaped reverse slope structure. Along the axial direction of the connecting post, the cross-sectional dimension of the first molding part 71 continuously and uniformly decreases from one end to the end closer to the second molding part 72. In this embodiment, the upper mold molding protrusion 51 is inserted into the lower mold groove 61, and the contact surface where the two fit together is the mold closing surface of this mold. The mold closing surface is a horizontal plane, and the axial direction of the deep-root connecting post is parallel to the mold closing surface. The first molding part in the molding cavity of the mold core adopts an inverted frustum-shaped molding surface, which is complementary to the frustum-shaped reverse slope structure of the upper connecting section of the product, and can accurately mold the required reverse slope feature.

[0034] This embodiment does not describe in detail the conventional auxiliary structures of the mold (such as guide pillar and guide sleeve positioning mechanisms, injection gates, ejection mechanisms, etc.). The above structures are all existing common structures of injection molds, and those skilled in the art can make conventional settings based on existing technology. The mold core is usually made of conventional mold materials such as mold steel, which has sufficient hardness and wear resistance to ensure the service life of the mold.

[0035] The content disclosed in the embodiments of this invention is only a preferred embodiment of the invention and is used only to illustrate the technical solutions of the invention, not to limit it. Although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this invention.

Claims

1. A deep-rooted explosion-proof zipper pull, comprising a zipper pull body, the zipper pull body having an upper base plate and a lower base plate disposed opposite to each other, and a deep-rooted connecting post disposed between the upper base plate and the lower base plate, characterized in that: The deep-rooted connecting post consists of an upper connecting section and a lower connecting section. The upper connecting section is located on the side closer to the upper substrate, and the lower connecting section is located on the side closer to the lower substrate. Only the upper connecting section is provided with a frustum-shaped reverse slope structure. In the direction perpendicular to the upper substrate, the overall cross-sectional dimension of the upper connecting section continuously and uniformly increases from the top near the upper substrate to the bottom near the lower connecting section, forming a frustum-shaped structure that is narrow at the top and wide at the bottom. The cross-sectional dimension of the bottom of the upper connecting section is larger than the cross-sectional dimension of the top of the lower connecting section, forming an annular step at the connection between the two.

2. The explosion-proof zipper head with deep-root split chain as described in claim 1, characterized in that, The upper connecting section is divided into an upper front connecting part and an upper rear connecting part along the front-rear direction of the zipper body, and the upper front connecting part and the upper rear connecting part are naturally and smoothly transitioned; the front end of the upper front connecting part is flat and gradually tapers at a preset angle along the head direction of the zipper body.

3. The explosion-proof zipper head with deep-root split chain according to claim 2, characterized in that, The front end of the upper rear connecting part is smoothly connected to the rear end of the upper front connecting part. The middle part of the upper rear connecting part is tightened inward. The rear end of the upper rear connecting part has a gradually converging pointed structure, and the tip of the pointed structure faces the rear side of the zipper body.

4. The explosion-proof zipper head with deep-root split chain as described in claim 1, characterized in that, The left and right sides of the upper connecting section are symmetrically arranged reverse slopes, and the reverse slopes form a preset angle of 70°-80° with the upper surface of the upper substrate.

5. The explosion-proof zipper head with deep-root split chain as described in claim 1, characterized in that, The lower connecting section is divided into a lower front section, a lower middle section, and a lower rear section in sequence along the front-back direction of the zipper body, with a natural and smooth transition between the three sections; the front end of the lower front section is flat and gradually tapers at a preset angle along the head direction of the zipper body.

6. The explosion-proof zipper head with deep-root split chain according to claim 5, characterized in that, The lower middle section is an inwardly tapering transition section, with a width smaller than the maximum width of the lower front section but larger than the maximum width of the lower rear section; the lower rear section has a gradually converging pointed structure, with the tip of the pointed structure pointing towards the rear side of the slider body.

7. The explosion-proof zipper head with deep-root split chain according to claim 1, characterized in that, The upper surface of the lower substrate is provided with a guide limiting protrusion. The front end of the guide limiting protrusion is connected to the bottom of the lower middle section and the bottom of the lower rear section of the lower connecting segment. The outer contour of the guide limiting protrusion is divided into two segments: the width of the front segment is less than or equal to the maximum width of the lower middle section and greater than the maximum width of the lower rear section; the width of the rear segment gradually decreases from the connection point of the two contours to the rear end; the connection point of the two contours is located directly below the rear end of the lower connecting segment.

8. The explosion-proof zipper head with deep-root split chain according to claim 7, characterized in that, The guide limiting protrusion and the lower connecting section are integrally formed.

9. A mold for forming the explosion-proof zipper head of the deep-rooted split zipper as described in any one of claims 1-8, characterized in that, Includes upper mold assembly, lower mold assembly, and mold core; The lower mold assembly has a lower mold groove, and the bottom of the lower mold groove has a lower mold core mounting groove; a lower mold side wall forming groove is formed on each of the two opposite side walls of the lower mold core mounting groove; a lower mold top surface forming groove is formed on the bottom surface of the lower mold groove directly adjacent to each lower mold side wall forming groove; the lower mold side wall forming groove and the lower mold top surface forming groove on the same side are connected, and the grooves on both sides of the lower mold core mounting groove together form a lower mold forming groove corresponding to a zipper head. The lower surface of the upper mold assembly is provided with at least two upper mold forming protrusions. The gap between two adjacent upper mold forming protrusions naturally forms an upper mold core mounting groove. The upper mold core mounting groove is vertically aligned with the lower mold core mounting groove. An upper mold sidewall forming groove is formed on each of the two opposite sidewalls of the upper mold core mounting groove. An upper mold top surface forming groove is formed on the bottom surface of each upper mold forming protrusion directly adjacent to each upper mold sidewall forming groove. The upper mold sidewall forming groove and the upper mold top surface forming groove on the same side are connected. The grooves on both sides of the upper mold core mounting groove together form an upper mold forming groove corresponding to a zipper head. In the mold-closed state, the upper mold forming protrusion is inserted into the lower mold groove, the upper mold core mounting groove and the lower mold core mounting groove are vertically aligned, and the upper mold forming groove and the lower mold forming groove are vertically opposite each other; The mold core is a sheet-like component that can be detachably inserted into the upper mold core mounting groove and the lower mold core mounting groove that are aligned with each other. The two opposite sides of the mold core are respectively provided with forming parts, which are through the thickness direction of the mold core. After the mold is closed, the forming parts of the mold core, the lower mold forming groove and the upper mold forming groove together form the zipper head forming cavity. The lower mold forming groove and the upper mold forming groove are used to form the non-middle area of ​​the zipper head, and the forming part of the mold core is used to form the middle area of ​​the zipper head. The middle area includes at least the part where the deep root connecting post is formed.

10. The mold for the explosion-proof zipper head according to claim 9, characterized in that, The number of mold cores is at least one; the bottom of the lower mold groove is provided with multiple lower mold core mounting grooves at intervals along the length direction, and the bottom of the upper mold forming protrusion is provided with multiple upper mold core mounting grooves; each upper mold core mounting groove and the corresponding lower mold core mounting groove are aligned vertically, and each mold core is inserted into a set of mutually aligned upper mold core mounting grooves and lower mold core mounting grooves; the through forming parts on both sides of each mold core cooperate with the upper mold forming grooves and lower mold forming grooves on the corresponding sides to form independent zipper head forming cavities.

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