A type of injection-molded safety shoe that integrates impact resistance, puncture resistance, insulation, and acid and alkali resistance.

Abstract

This invention relates to the field of protective equipment technology and discloses an injection-molded safety shoe that integrates anti-impact, anti-puncture, insulation, and acid and alkali resistance. The shoe includes a sole, a toe cap fixedly connected to the top of the forefoot of the sole, an upper fixedly connected to the side of the toe cap, and the top of the sole fixedly connected to the bottom of the upper. The sole, toe cap, and upper completely cover the foot. A detachable anti-impact cap assembly is fixedly connected to the side of the sole. This invention utilizes an integrated injection molding process, where the upper and sole are fused together using injection molding material. The anti-impact toe cap and puncture-resistant midsole are covered and fixed by the injection molding material during the injection molding process. The entire shoe body has no adhesive or stitched interfaces, avoiding delamination and peeling problems caused by adhesive aging and stitch breakage during long-term use, achieving a permanent and secure bond between the functional layers.

Description

Technical Field

[0001] This invention relates to the field of protective equipment technology, and more specifically to an injection-molded safety shoe that integrates anti-impact, anti-puncture, insulation, and acid and alkali resistance. Background Technology

[0002] Safety shoes are essential protective equipment for workers' feet in industrial production. They are widely used in foot safety protection in industries such as construction, metallurgy, power, chemical, machinery manufacturing, and mining. Depending on the hazardous factors in different working environments, safety shoes need to have one or more of the following protective functions: impact resistance, puncture resistance, insulation, acid and alkali resistance, slip resistance, and oil resistance. Currently, most safety shoes on the market with multiple protective functions adopt a multi-layer composite structure, combining different functional material layers and protective components together through methods such as gluing, sewing, or simple physical stacking. For example, an impact-resistant toe cap is fixed at the toe area by sewing or gluing, a puncture-resistant midsole is embedded in the middle layer of the sole, and the outsole is made of acid and alkali resistant rubber or polyurethane materials to achieve multiple protective functions. However, the following problems still exist: Existing safety shoes have a multi-layered composite structure that relies on adhesives or stitching, which is prone to delamination and unstable protective performance after long-term use. The anti-impact toe caps and puncture-resistant insoles in existing safety shoes lack reliable fixing structures, are prone to displacement, and affect the protective position. Furthermore, they can only provide impact protection, and are less effective in terms of puncture protection, insulation, and acid and alkali resistance. In order to ensure flexibility during movement, current safety shoes can only add some leather structures to the instep area, which are also ineffective in providing impact protection. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide an injection-molded safety shoe that integrates anti-impact, anti-puncture, insulation, and acid and alkali resistance, so as to solve the technical problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a molded safety shoe integrating anti-impact, anti-puncture, insulation, and acid and alkali resistance, comprising a sole, a toe cap fixedly connected to the top of the forefoot of the sole, an upper fixedly connected to the side of the toe cap, the top of the sole fixedly connected to the bottom of the upper, the sole, toe cap, and upper completely covering the foot, a detachable anti-impact cap assembly fixedly connected to the side of the sole, the sole comprising an outsole and a midsole, the outsole contacting the ground, the midsole fixed above the outsole, an anti-puncture midsole piece embedded between the outsole and the midsole, the upper surface of the anti-puncture midsole piece being attached to the lower surface of the midsole, the lower surface of the anti-puncture midsole piece being attached to the upper surface of the outsole, the edge of the anti-puncture midsole piece being covered and fixed by the injection molding material of the outsole and midsole, the sole, toe cap, and upper being integrally injection molded.

[0005] In a preferred embodiment, the outsole is made of insulating and acid- and alkali-resistant polyurethane material, the midsole is made of microporous foamed polyurethane material, the outsole and the midsole are integrally molded by a dual-density injection molding process, and the density of the outsole is higher than that of the midsole.

[0006] In a preferred embodiment, the outsole is a high-density polyurethane outer layer with a Shore hardness of 65A to 85A and a thickness of 3mm to 6mm, and the insole is a microporous foamed polyurethane inner layer with a density of 0.4g / cm³. 3 ~0.8g / cm 3 The thickness is 5mm to 10mm, and the puncture-resistant insole is made of aramid fiber composite material.

[0007] In a preferred embodiment, the bottom surface of the outsole is provided with an anti-slip pattern, and the outsole and the anti-slip pattern are integrally injection molded. The acid and alkali resistance of the outsole meets the following requirements: after being immersed in 98% sulfuric acid and 40% sodium hydroxide solution at room temperature for 72 hours respectively, its volume change rate is ≤5% and its hardness change rate is ≤10%. The combined insulation performance of the outsole and the midsole is ≥6kV and the leakage current is ≤10mA.

[0008] In a preferred embodiment, the toe cap is provided with an anti-smashing head, which is a plastic steel head with an impact resistance of ≥200J and a static pressure bearing capacity of ≥15kN. The anti-smashing head is covered and fixed inside the toe cap during the injection molding process.

[0009] In a preferred embodiment, the upper is made of one or more of cowhide, synthetic leather, and breathable mesh fabric, and the lower end of the upper is integrally connected to the sole by injection molding, wherein the injection molding material penetrates into the fiber gaps of the upper fabric to form a firm bond.

[0010] In a preferred embodiment, the detachable anti-smashing cover assembly is located above the shoe upper, and the bottom end of the detachable anti-smashing cover assembly does not contact the sole or the toe cap.

[0011] In a preferred embodiment, the detachable anti-smashing cover assembly includes an anti-smashing cover, with connecting plates fixedly connected to the four corners of the bottom end of the anti-smashing cover. Each connecting plate has a lower connecting seat fixedly connected to its bottom end. A threaded connecting rod is threadedly connected to the inside of the lower connecting seat. A shoe upper connecting seat is threadedly connected to the side of the threaded connecting rod near the sole. The shoe upper connecting seat and the lower connecting seat are positioned correspondingly. The threaded connecting rod connects the lower connecting seat and the shoe upper connecting seat.

[0012] In a preferred embodiment, a screw handle is fixedly connected to the side of the threaded connecting rod away from the upper connecting seat. The side of the screw handle is provided with anti-slip texture. The upper connecting seat and the sole are integrally injection molded. When the threaded connecting rod connects the lower connecting seat and the upper connecting seat, the anti-smashing cover is located at the top of the upper for auxiliary anti-smashing. When the threaded connecting rod leaves the lower connecting seat and the upper connecting seat, the anti-smashing cover leaves the top of the upper, and the detachable anti-smashing cover assembly is completely separated from the sole.

[0013] In a preferred embodiment, both the lower connecting seat and the upper connecting seat are metal inserts. The upper connecting seat is fixedly connected to the upper by injection molding and the lower connecting seat is fixedly connected to the anti-smashing cover by injection molding.

[0014] The technical effects and advantages of this invention are as follows: 1. This invention uses an integrated injection molding process to fuse the upper and sole together with injection molding material. The anti-impact toe cap and puncture-resistant midsole are covered and fixed by the injection molding material during the injection molding process. There are no adhesive or sewing interfaces on the entire shoe body, which avoids the problems of delamination and separation caused by adhesive aging and sewing breakage during long-term use, and achieves a permanent and firm bond between the functional layers. 2. This invention uses injection molding material to penetrate into the fiber gaps of the shoe upper fabric in a molten state. After cooling and solidification, it forms countless micro-anchor points, which firmly anchor the shoe upper and the sole into one piece. Its peel strength is higher than that of traditional adhesive shoes. In addition, the outsole is made of insulating and acid and alkali resistant polyurethane material, so that a pair of work shoes can simultaneously have four protective functions: anti-impact, anti-puncture, insulation, and acid and alkali resistance. 3. In this invention, the lower connecting seat is connected to the lower connecting seat by a threaded connecting rod, and the shoe upper connecting seat fixes the position of the lower connecting seat, so that the anti-smashing cover is located above the shoe upper. The anti-smashing cover has a good anti-smashing effect, and there is a certain distance between the anti-smashing cover and the shoe upper, which reduces the impact on movement. In low-risk situations, the lower connecting seat and the shoe upper connecting seat can be separated, and the anti-smashing cover can be removed, thus avoiding any impact on movement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 This is a schematic diagram of the sole structure of the present invention.

[0017] Figure 3 This is a schematic diagram of the detachable anti-smashing cover assembly of the present invention.

[0018] The attached diagram is labeled as follows: 1. Outsole; 11. Outsole; 12. Midsole; 2. Toe cap; 3. Upper; 4. Detachable anti-smashing cover assembly; 401. Anti-smashing cover; 402. Connecting plate; 403. Lower connecting seat; 404. Threaded connecting rod; 405. Tightening handle; 406. Upper connecting seat. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The injection-molded safety shoe that integrates anti-impact, anti-puncture, insulation and acid and alkali resistance involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 Reference Figure 1 , Figure 2 as well as Figure 3 This invention provides an injection-molded safety shoe that integrates anti-impact, anti-puncture, insulation, and acid and alkali resistance. It includes a sole 1, a toe cap 2 fixedly connected to the top of the forefoot of the sole 1, an upper 3 fixedly connected to the side of the toe cap 2, and the top of the sole 1 fixedly connected to the bottom of the upper 3. The sole 1, toe cap 2, and upper 3 completely cover the foot. A detachable anti-impact cover assembly 4 is fixedly connected to the side of the sole 1. The sole 1 includes an outsole 11 and... The midsole 12 and outsole 11 are in contact with the ground. The midsole 12 is fixed above the outsole 11. A puncture-resistant midsole piece is embedded between the outsole 11 and the midsole 12. The upper surface of the puncture-resistant midsole piece is attached to the lower surface of the midsole 12, and the lower surface of the puncture-resistant midsole piece is attached to the upper surface of the outsole 11. The edge of the puncture-resistant midsole piece is covered and fixed by the injection molding material of the outsole 11 and the midsole 12. The sole 1, toe cap 2, and upper 3 are integrally injection molded.

[0021] In this embodiment, the shoe body is integrally injection molded, eliminating any adhesive or stitched interfaces. This fundamentally avoids delamination and separation caused by adhesive aging and stitch breakage during long-term use, achieving a permanent and firm bond between functional layers. The puncture-resistant midsole is fully encapsulated and fixed by injection molding material, preventing displacement during use and ensuring the accuracy of the puncture protection position. The detachable impact protection cover assembly 4 allows users to selectively install or remove it according to the hazard level of the working environment. It can be installed when additional impact protection is needed and removed when not needed to reduce weight and improve flexibility.

[0022] Reference Figure 1The outsole 11 is made of insulating, acid and alkali resistant polyurethane material, while the midsole 12 is made of microporous foamed polyurethane material. The outsole 11 and midsole 12 are integrally molded using a dual-density injection molding process, with the outsole 11 having a higher density than the midsole 12. The outsole 11 is a high-density polyurethane outer layer with a Shore hardness of 65A–85A and a thickness of 3mm–6mm, providing abrasion resistance and acid and alkali resistance. The midsole 12 is a microporous foamed polyurethane inner layer with a density of 0.4 g / cm³. 3 ~0.8g / cm 3 The thickness is 5mm to 10mm, used to provide cushioning and shock absorption performance and electrical insulation performance. The puncture-resistant insole is made of aramid fiber composite material. The bottom surface of the outsole 11 has anti-slip pattern. The outsole 11 and the anti-slip pattern are integrally injection molded. The acid and alkali resistance of the outsole 11 meets the following requirements: after being immersed in 98% sulfuric acid and 40% sodium hydroxide solution at room temperature for 72 hours, its volume change rate is ≤5% and its hardness change rate is ≤10%. The combined insulation performance of the outsole 11 and the insole 12 is ≥6kV and the leakage current is ≤10mA.

[0023] In this embodiment, the high-density outsole 11 provides excellent wear resistance and acid / alkali resistance, while the low-density microporous foam midsole 12 provides good cushioning and shock absorption as well as electrical insulation. At the injection molding interface, molecular chains undergo interdiffusion and chemical cross-linking, forming a seamless fused bond layer, eliminating the risk of adhesive delamination. The dual-density integrated molding also simplifies the manufacturing process. The microporous foam structure of the midsole 12 forms numerous closed air bubbles. These bubbles absorb and disperse impact energy through compression deformation when impacted, providing cushioning. Simultaneously, the closed air... The air gap formed by the bubbles blocks the current conduction path, giving the sole excellent electrical insulation properties; the puncture-resistant midsole made of aramid fiber composite material has the advantages of high strength, high shear resistance and lightweight flexibility, which improves the flexibility and wearing comfort of the sole while ensuring puncture resistance; the one-piece injection molding ensures that the pattern will not fall off due to adhesive aging, and provides durable anti-slip grip on oily or wet surfaces; the acid and alkali resistance meets the requirements, and it can maintain structural integrity and protective function for a long time in strong acid and alkali environments; the insulation properties protect the life safety of electrical workers.

[0024] Reference Figure 1 The toe cap 2 is equipped with an anti-smashing head, which is made of plastic steel and has an impact resistance of ≥200J and a static pressure bearing capacity of ≥15kN. The anti-smashing head is covered and fixed inside the toe cap 2 during the injection molding process.

[0025] In this embodiment, the anti-smashing head is completely covered and fixed by polyurethane material during the injection molding process, without any adhesive or sewing interface, ensuring that the anti-smashing head will not shift during use and always accurately covers the protective position directly above the toes. The reinforcing fibers inside the plastic steel material are distributed in a three-dimensional network in the resin matrix. When subjected to external impact, the resin matrix first absorbs part of the impact energy through plastic deformation, and then the reinforcing fibers continue to consume the impact energy through the process of fracture and pull-out, realizing the graded dissipation of impact energy.

[0026] Reference Figure 1 The upper 3 is made of one or more of cowhide, synthetic leather and breathable mesh fabric. The lower end of the upper 3 is integrally connected to the sole 1 by injection molding. The injection material penetrates into the fiber gaps of the upper 3 fabric to form a firm bond.

[0027] In this embodiment, the combination of cowhide, synthetic leather, or breathable mesh provides a selectable balance of abrasion resistance, breathability, and comfort. The lower end of the upper 3 is integrally connected to the sole 1 by injection molding. The injection material penetrates into the fiber gaps of the upper fabric under injection pressure, and after cooling and solidification, it forms countless micro-anchor points, which firmly anchor the upper and sole into one piece to improve the stability.

[0028] Reference Figure 1 and Figure 3 The detachable anti-smashing cover assembly 4 is located above the upper 3 of the shoe, and the bottom of the detachable anti-smashing cover assembly 4 does not contact the sole 1 or the toe cap 2.

[0029] In this embodiment, the bottom end of the detachable anti-smashing cover assembly 4 does not contact the sole 1 or the toe cap 2, so there will be no interference or friction, thus avoiding the impact on normal walking flexibility.

[0030] Reference Figure 1 and Figure 3The detachable anti-smashing cover assembly 4 includes an anti-smashing cover 401. Connecting plates 402 are fixedly connected to the four corners of the bottom of the anti-smashing cover 401. A lower connecting seat 403 is fixedly connected to the bottom of each connecting plate 402. A threaded connecting rod 404 is threadedly connected to the inside of the lower connecting seat 403. A shoe upper connecting seat 406 is threadedly connected to the side of the threaded connecting rod 404 near the sole 1. The shoe upper connecting seat 406 corresponds to the lower connecting seat 403. The threaded connecting rod 404 connects the lower connecting seat 403 and the shoe upper connecting seat 406. A screw handle 405 is fixedly connected to the side of the connecting rod 404 away from the upper connecting seat 406. The side of the screw handle 405 has anti-slip texture. The upper connecting seat 406 and the sole 1 are integrally injection molded. When the threaded connecting rod 404 connects the lower connecting seat 403 and the upper connecting seat 406, the anti-smashing cover 401 is located at the top of the upper 3 to provide auxiliary anti-smashing protection. When the threaded connecting rod 404 leaves the lower connecting seat 403 and the upper connecting seat 406, the anti-smashing cover 401 leaves the top of the upper 3, and the detachable anti-smashing cover assembly 4 is completely separated from the sole 1. Both the lower connecting seat 403 and the upper connecting seat 406 are metal inserts. The upper connecting seat 406 is fixedly connected to the upper 3 by injection molding pre-embedding, and the lower connecting seat 403 is fixedly connected to the anti-smashing cover 401 by injection molding pre-embedding.

[0031] In this embodiment, the threaded connection provides a stable locking force that will not loosen under walking vibration. Users can quickly install or remove the device without special tools. The four-corner connection layout ensures that the anti-smashing cover 401 is evenly stressed. When impacted, the impact force is evenly transmitted to the sole 1 through the four connection points, avoiding excessive stress at a single point that could lead to connection failure. The lower connecting seat 403 and the upper connecting seat 406 are metal inserts and are fixed by injection molding. The metal material provides sufficient threaded connection strength, ensuring that the threaded connecting rod 404 will not experience thread stripping or fatigue fracture during repeated tightening and loosening.

[0032] Example 2 The embodiments of this application provide a method for manufacturing injection-molded safety shoes that integrate anti-impact, anti-puncture, insulation, and acid and alkali resistance, comprising the following steps: Step S1: Prefabricate the upper 3. Cut the upper material according to the design pattern and then sew it into the shape of the upper 3. When sewing, reserve the installation space for the anti-smashing toe cap at the toe part of the upper 3, reserve the connecting edge that folds outward at the lower end of the upper 3, and open the through hole for the injection molding material to penetrate on the connecting edge. Step S2: Install the anti-smashing toe cap. Place the anti-smashing toe cap into the installation space of the toe part of the shoe upper 3. Use the positioning tool to ensure that the anti-smashing toe cap covers the protective position directly above the toes. After installation, fix the anti-smashing toe cap in the toe compartment with temporary stitches or positioning tape. Step S3: Fit the shoe last. Fit the shoe upper 3 with the anti-smashing toe cap installed onto the standard shoe last, smooth it out, and ensure that the surface of the shoe upper 3 is free of wrinkles and skew, and that the connecting edge is naturally folded downwards. Step S4: Place the shoe last with the upper 3 on it into the injection mold and close the mold. The injection mold has a positioning structure that matches the shoe last. Place the upper connecting seat 406 into the injection mold. The injection mold has a positioning structure for the upper connecting seat 406 to ensure that the upper 3 and the upper connecting seat 406 are accurately positioned in the mold. Step S5: Position the puncture-resistant insole. Place the puncture-resistant insole precisely between outsole 11 and 12 using the positioning structure in the mold. The puncture-resistant insole is made of aramid fiber composite material, and Kevlar fiberboard can be used. The edge of the puncture-resistant insole has an upward-bent flange structure. After positioning, close and lock the mold. Step S6: Inject insulating, acid and alkali resistant polyurethane injection molding material into the mold, and use a dual-density injection molding process to sequentially form the midsole 12 and outsole 11, specifically including the following sub-steps: Step S61: Inject midsole material. Heat the microporous foamed polyurethane material to a molten state and inject it into the mold cavity to form midsole 12. During the injection molding process, the molten polyurethane material penetrates into the fiber gaps of the fabric at the lower end of the upper 3 and passes through the through holes on the connecting edge. At the same time, it wraps the flange structure of the puncture-proof midsole and initially positions the puncture-proof midsole. Step S62: After the midsole 12 material is injected, wait for an interval of 5s to 30s to keep the surface of the midsole 12 reactive. Step S63: Inject outsole material. After the interval period, immediately inject high-density polyurethane material into the same mold to form outsole 11. The high-density polyurethane injected later and the microporous foamed polyurethane injected earlier undergo molecular chain diffusion and chemical cross-linking reaction at the interface to form an interface-free molten bonding layer. The injection molding material further covers the lower end and surrounding area of ​​the anti-smashing toe cap, completely covering and fixing the anti-smashing toe cap inside the toe cap 2, and completely covering the upper surface, lower surface and edge of the puncture-proof midsole. Fix the puncture-proof midsole between outsole 11 and midsole 12, and fix the upper connecting seat 406 to the side of outsole 11. Step S7: Cooling and demolding. After molding, maintain pressure in the mold and cool and solidify. The cooling time is 60s to 120s. After cooling, open the mold and take out the finished product. Remove the shoe body from the shoe last to obtain an integrated injection-molded work shoe semi-finished product. Step S8, trimming and post-processing: Trim the edges of the demolded injection-molded safety shoes, remove the flash, overflow and gate residue generated during the injection molding process, and remove dust and impurities from the surface of the shoe.

[0033] In summary, this application simultaneously fixes and combines the upper, anti-impact toe cap, puncture-resistant midsole, and upper connector 406 during dual-density injection molding. This allows the molten polyurethane material to penetrate into the fiber gaps and through-holes along the connecting edge of the upper fabric, and to fully cover the anti-impact toe cap, the puncture-resistant midsole flange structure, and the anti-detachment structure of the upper connector. After cooling, a permanent integrated structure without any adhesive or stitching interfaces is formed. This eliminates the risk of delamination, ensures that the protective components are not easily displaced, and reliably integrates and stably performs the four core protective functions of anti-impact, anti-puncture, insulation, and acid and alkali resistance within the same shoe body. The entire manufacturing process only requires one injection molding to complete the sole molding, upper bonding, and fixation of multiple protective components, simplifying the production process and improving product consistency and yield.

[0034] The working principle of this invention: The outsole 11 is made of high-density polyurethane material, which has high tear resistance and abrasion resistance, and can effectively resist the wear caused by friction with the ground during walking. The dense molecular structure of high-density polyurethane material hinders the penetration and diffusion of corrosive media such as acids and alkalis. When the outsole 11 is immersed in acidic or alkaline solutions, the interaction between the polar groups in the polyurethane molecular chain and the corrosive media is restricted to the surface of the material and cannot penetrate into the interior of the material, thereby achieving acid and alkali resistance protection. In addition, the insulation performance of the outsole 11 and the midsole 12 provides an insulation effect. The anti-smashing toe cap is located inside the toe cap 2 and is covered and fixed by polyurethane material during the injection molding process. The reinforcing fibers inside the plastic steel material are distributed in a three-dimensional network in the resin matrix. When the anti-smashing toe cap is hit, the resin matrix first absorbs part of the impact energy through plastic deformation, and then the reinforcing fibers continue to consume the impact energy through the process of breaking and pulling out, thereby achieving graded dissipation of impact energy. The puncture-resistant midsole is embedded between the outsole 11 and the midsole 12. When the foot steps on a nail or other sharp object, the sharp object's tip generates a concentrated puncture force on the sole. The high-strength material of the puncture-resistant midsole has extremely high shear resistance, so the sharp object's tip cannot penetrate the material layer of the midsole. At the same time, the midsole diffuses the concentrated force of the sharp object through the plate surface to a larger area, reducing the pressure per unit area and preventing the sharp object from piercing the sole of the foot. When the upper part of the shoe upper 3 is protected against impact, the shoe upper connecting seat 406 is fixed to the side of the sole 1 by injection molding, and the lower connecting seat 403 is fixed to the bottom of the anti-impact cover 401 by injection molding. The lower connecting seat 403 and the shoe upper connecting seat 406 are screwed together by the threaded connecting rod 404. The anti-impact cover 401 is fixed to the top of the shoe upper 3. When a heavy object falls on the upper part of the shoe upper 3, the anti-impact cover 401 bears the impact force and guides the impact force to the sole 1 through the connecting plate 402 and the lower connecting seat 403, thus achieving the anti-impact effect. When anti-impact is not needed, the threaded connecting rod 404 is unscrewed to separate the entire detachable anti-impact cover assembly 4 from the sole 1, which will not affect the movement.

[0035] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented in software, the above embodiments can be implemented, in whole or in part, as a computer program product. The units and algorithm steps of the various examples described in the embodiments can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0036] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0037] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0038] In conclusion, the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A type of injection-molded safety shoe that integrates impact resistance, puncture resistance, insulation, and acid and alkali resistance, characterized in that: The shoe includes a sole (1), a toe cap (2) fixedly connected to the top of the forefoot of the sole (1), an upper (3) fixedly connected to the side of the toe cap (2), the top of the sole (1) and the bottom of the upper (3) fixedly connected, the sole (1), the toe cap (2) and the upper (3) completely cover the foot, a detachable anti-smashing cover assembly (4) fixedly connected to the side of the sole (1), the sole (1) includes an outsole (11) and a midsole (12), the outsole (11) In contact with the ground, the midsole (12) is fixed above the outsole (11). A puncture-resistant midsole piece is embedded between the outsole (11) and the midsole (12). The upper surface of the puncture-resistant midsole piece is attached to the lower surface of the midsole (12). The lower surface of the puncture-resistant midsole piece is attached to the upper surface of the outsole (11). The edge of the puncture-resistant midsole piece is covered and fixed by the injection molding material of the outsole (11) and the midsole (12). The sole (1), toe cap (2), and upper (3) are integrally injection molded.

2. The injection-molded safety shoe according to claim 1, which integrates anti-impact, anti-puncture, insulation, and acid and alkali resistance, is characterized in that: The outsole (11) is made of insulating acid and alkali resistant polyurethane material, and the midsole (12) is made of microporous foamed polyurethane material. The outsole (11) and the midsole (12) are integrally formed by dual-density injection molding process, and the density of the outsole (11) is higher than that of the midsole (12).

3. The injection-molded safety shoe according to claim 2, which integrates anti-impact, anti-puncture, insulation, and acid and alkali resistance, is characterized in that: The outsole (11) is a high-density polyurethane outer layer with a Shore hardness of 65A to 85A and a thickness of 3mm to 6mm. The insole (12) is a microporous foamed polyurethane inner layer with a density of 0.4g / cm³. 3 ~0.8g / cm 3 The thickness is 5mm to 10mm, and the puncture-resistant insole is made of aramid fiber composite material.

4. The injection-molded safety shoe according to claim 3, which integrates anti-impact, anti-puncture, insulation, and acid and alkali resistance, is characterized in that: The bottom surface of the outsole (11) is provided with anti-slip pattern. The outsole (11) and the anti-slip pattern are integrally injection molded. The acid and alkali resistance of the outsole (11) meets the following requirements: after being immersed in 98% sulfuric acid and 40% sodium hydroxide solution at room temperature for 72 hours, its volume change rate is ≤5% and its hardness change rate is ≤10%. The combined insulation performance of the outsole (11) and the insole (12) is ≥6kV and the leakage current is ≤10mA.

5. The injection-molded safety shoe according to claim 1, which integrates anti-impact, anti-puncture, insulation, and acid and alkali resistance, is characterized in that: The toe cap (2) is provided with an anti-smashing head inside. The anti-smashing head is made of plastic steel and has an impact resistance of ≥200J and a static pressure bearing capacity of ≥15kN. The anti-smashing head is covered and fixed inside the toe cap (2) during the injection molding process.

6. The injection-molded safety shoe according to claim 1, which integrates anti-impact, anti-puncture, insulation, and acid and alkali resistance, is characterized in that: The upper (3) is made of one or more of cowhide, synthetic leather and breathable mesh fabric. The lower end of the upper (3) is integrally connected to the sole (1) by injection molding. The injection molding material penetrates into the fiber gaps of the upper (3) fabric to form a firm bond.

7. The injection-molded safety shoe according to claim 1, which integrates anti-impact, anti-puncture, insulation, and acid and alkali resistance, is characterized in that: The detachable anti-smashing cover assembly (4) is located above the shoe upper (3), and the bottom end of the detachable anti-smashing cover assembly (4) does not contact the shoe sole (1) and the shoe toe cover (2).

8. The injection-molded safety shoe according to claim 1, which integrates anti-impact, anti-puncture, insulation, and acid and alkali resistance, is characterized in that: The detachable anti-smashing cover assembly (4) includes an anti-smashing cover (401) that can prevent smashing. Each of the four corners of the bottom of the anti-smashing cover (401) is fixedly connected to a connecting plate (402). Each connecting plate (402) is fixedly connected to a lower connecting seat (403) at its bottom. The lower connecting seat (403) is internally threaded with a threaded connecting rod (404). The threaded connecting rod (404) is threadedly connected to a shoe upper connecting seat (406) on the side near the sole (1). The shoe upper connecting seat (406) is positioned opposite to the lower connecting seat (403). The threaded connecting rod (404) connects the lower connecting seat (403) and the shoe upper connecting seat (406).

9. A type of injection-molded safety shoe according to claim 8, integrating anti-impact, anti-puncture, insulation, and acid and alkali resistance, characterized in that: The threaded connecting rod (404) is fixedly connected to a screw handle (405) on the side away from the shoe upper connecting seat (406). The screw handle (405) has anti-slip texture on its side. The shoe upper connecting seat (406) and the shoe sole (1) are integrally injection molded. When the threaded connecting rod (404) connects the lower connecting seat (403) and the shoe upper connecting seat (406), the anti-smashing cover (401) is located at the top of the shoe upper (3) to assist in anti-smashing. When the threaded connecting rod (404) leaves the lower connecting seat (403) and the shoe upper connecting seat (406), the anti-smashing cover (401) leaves the top of the shoe upper (3). The detachable anti-smashing cover assembly (4) is completely separated from the shoe sole (1).

10. A type of injection-molded safety shoe according to claim 9, integrating anti-impact, anti-puncture, insulation, and acid and alkali resistance, characterized in that: Both the lower connecting seat (403) and the upper connecting seat (406) are metal inserts. The upper connecting seat (406) and the upper (3) are fixedly connected by injection molding. The lower connecting seat (403) and the anti-smashing cover (401) are fixedly connected by injection molding.

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