A kind of high polymer composite material made safety shoe midsole puncture resistance testing device

Abstract

The application discloses a kind of high polymer composite material made safety shoes midsole puncture resistance test device, including chassis, the upper end of the chassis is fixedly connected with semicylinder, semicylinder is provided with inner cavity, strip-shaped mouth is opened on the side wall of the inner cavity, the upper end of the chassis is installed with the rotating table that can intermittently rotate a quarter of a circle, part of the rotating table penetrates strip-shaped mouth, and extend to inner cavity, the inner wall of the inner cavity is fixedly connected with partition, the partition is cooperated with rotating table.This application realizes the multi-point, high efficiency, high accuracy puncture resistance detection of safety shoes midsole with high polymer composite material as main body under normal temperature and high temperature environment, effectively overcomes the technical defects of existing detection equipment unit detection, unable to simulate high temperature working condition, low detection efficiency, provides reliable detection means for quality control and performance optimization of high polymer composite material shoe midsole.

Description

Technical Field

[0001] This invention relates to the field of new material shoe midsole testing, and more particularly to a puncture resistance testing device for work shoe midsoles made of polymer composite materials. Background Technology

[0002] Safety shoes are footwear designed to protect the feet. The midsole is a crucial protective component, typically placed at the bottom of the shoe and shaped to fit the foot, effectively preventing injuries from sharp objects. Currently, the materials used for safety shoe midsoles include steel plates, steel wire mesh, aramid fiber composites, and polymer composites. Among these, midsoles made primarily of polymer composites offer advantages such as lightweight, flexibility, and high plasticity, leading to their increasingly widespread use in safety shoe manufacturing.

[0003] However, the puncture resistance of shoe midsoles primarily composed of polymer composites is closely related to the material's formulation and processing technology. Different resin matrices, types and proportions of reinforcing fibers, and curing process parameters all significantly affect the mechanical properties of the shoe midsole. In particular, under high temperature and humid conditions, the polymer chain segment movement of these polymer composite shoe midsoles intensifies, the material softens, and its puncture resistance significantly decreases. This is fundamentally different from the relatively stable performance of traditional steel plate midsoles at different temperatures. Therefore, for shoe midsoles primarily composed of polymer composites, more comprehensive and accurate puncture resistance testing methods are needed to evaluate their actual protective performance under different working conditions.

[0004] Currently, the most common puncture resistance testing equipment for work shoes typically involves placing the midsole of the shoe to be tested on a shoe holder, and then moving the testing needle vertically downwards to apply pressure to the surface of the midsole. The equipment then observes whether the midsole is penetrated or the depth to which the testing needle penetrates, thereby determining the puncture resistance of the midsole.

[0005] However, the existing testing equipment still has the following shortcomings in practical use: First, the testing needle can only perform puncture tests on a single location on the midsole during each test, which cannot fully reflect the differences in puncture resistance in different areas of the midsole, resulting in relatively low accuracy. Second, the testing environment of the above equipment is usually at room temperature, which cannot simulate complex working conditions such as high temperature and humid heat. In high temperature environments, the molecular chain movement of shoe midsoles, which are mainly composed of polymer composite materials, intensifies and the material softens, which changes the puncture resistance. Existing technology cannot provide comprehensive and reliable testing data support for the research and development improvement of polymer composite shoe midsoles and the quality control of factory products. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a puncture resistance testing device for the midsole of work shoes made of polymer composite materials. This testing device has good continuity, improves the testing rate, and can also simulate testing under high-temperature conditions, which better meets the needs of actual use and improves the accuracy of testing.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A puncture resistance testing device for the midsole of a work shoe made of polymer composite material includes a base frame. A semi-cylinder is fixedly connected to the upper end of the base frame. An inner cavity is provided inside the semi-cylinder. A strip-shaped opening is formed on one side wall of the inner cavity. A rotating platform capable of intermittently rotating one-quarter turns is installed at the upper end of the base frame. A portion of the rotating platform passes through the strip-shaped opening and extends into the inner cavity. A partition is fixedly connected between the inner walls of the inner cavity. The partition cooperates with the rotating platform to divide the inner cavity into a room temperature testing zone and a sealed high temperature testing zone. An electric heating ring is installed at the top inner part of the high temperature testing zone. The room temperature testing zone and the high temperature testing zone rotate along the rotating platform. The movement direction is arranged sequentially. Testing mechanisms are installed in both the normal temperature testing area and the high temperature testing area. Each testing mechanism includes a second L-shaped frame installed at the top of the normal temperature testing area and the high temperature testing area, respectively. A cylinder is installed on the horizontal part of the second L-shaped frame, and a pressure plate is fixedly connected to the output shaft of the cylinder. Three detection nails are fixedly connected to the lower end of the pressure plate. A high-pressure gas injection mechanism is located below the base frame. After each rotation table stops working, high-pressure gas can be injected into the sealed high-temperature testing area to generate high pressure inside, increasing the speed at which high temperature penetrates the shoe midsole and reducing the waiting time for heating.

[0009] Preferably, a drive motor is installed at the lower end of the base frame. The drive motor is a dual-axis motor. The upper output shaft of the drive motor passes through the base frame and is fixedly connected to the lower end of the rotary table. Four placement slots are provided at the upper end of the rotary table.

[0010] Preferably, the high-pressure gas injection mechanism includes a piston cylinder installed at the lower end of the base frame, a piston plate that can slide left and right is provided inside the piston cylinder, the right side of the piston plate is elastically connected to the right side wall of the piston cylinder by a second spring, a third rack is fixedly connected to the left side of the piston plate, a first L-shaped frame is fixedly connected to the lower end of the base frame, a gearbox is installed at the lower end of the horizontal part of the first L-shaped frame, the lower output shaft of the drive motor is fixedly connected to the input shaft of the gearbox, an incomplete gear is fixedly connected to the output shaft of the gearbox, and the incomplete gear cooperates with the third rack.

[0011] Preferably, two guide plates are fixedly connected to the left side wall of the piston cylinder, and the opposite sides of the two guide plates are in contact with the third rack and are slidably connected.

[0012] Preferably, the right side space of the piston cylinder is connected to the outside through a one-way port, and the right side space of the piston cylinder is connected to the high-temperature test area through a one-way pipe.

[0013] Preferably, a first one-way valve is installed inside the one-way port, and the flow direction of the first one-way valve is one-way into the piston cylinder from the outside. A second one-way valve is installed inside the one-way pipe, and the flow direction of the second one-way valve is one-way into the high-temperature test area from the right side space of the piston cylinder.

[0014] Preferably, the high-temperature test area has a vent at the top, and a solenoid valve is installed inside the vent. The solenoid valve can be de-energized after the drive motor has been running for 5 seconds.

[0015] Preferably, the system further includes a pressurizing mechanism, which includes two connecting cylinders fixedly connected to the upper end of the semi-cylinder. The bottom of each of the two connecting cylinders is provided with a columnar groove communicating with the inner cavity. A sliding block is slidably connected inside each columnar groove. The upper end of each sliding block is elastically connected to the inner top of the columnar groove through a first spring. A limit ring is fixedly connected to the inner wall of each columnar groove. A connecting rod is fixedly connected to the upper end of each sliding block. The upper ends of the two connecting rods extend to the outside and are jointly fixedly connected to a connecting plate.

[0016] Preferably, both the room temperature test area and the high temperature test area are fixedly connected to a fixed frame, each fixed frame is fixedly connected to a U-shaped frame, the lower end of each sliding block is fixedly connected to a first rack, the lower end of each first rack extends into the corresponding U-shaped frame and is slidably connected thereto, a second rack is slidably connected in each U-shaped frame, a pressure plate is fixedly connected to the lower end of each second rack, each pressure plate has a strip-shaped through-hole, a rotating shaft is rotatably connected between the inner walls of each U-shaped frame, a transmission gear is fixedly connected to each rotating shaft, and each transmission gear meshes with the corresponding first rack and second rack.

[0017] Preferably, the sliding block that cooperates with the high-temperature test zone is a rubber piston block, which can slide upward when the air pressure inside the high-temperature test zone increases.

[0018] Compared with the prior art, the beneficial effects of this invention are as follows:

[0019] 1. This application uses a cylinder to output a fixed pressure, which simultaneously pushes multiple testing nails to perform multi-point puncture testing on the midsole of a polymer composite shoe. Compared with the traditional single-nail single-position testing method, it can obtain puncture resistance data of multiple areas of the midsole at one time, effectively improving the accuracy and representativeness of the test results. It is especially suitable for testing needs where the puncture resistance performance of polymer composite shoe midsoles may be uneven in different areas due to differences in formulation and process.

[0020] 2. In the room temperature testing process, this application uses a rack and pinion transmission mechanism to drive the pressure plate downwards, applying pressure and limiting force to the polymer composite shoe midsole. Because the polymer composite shoe midsole has a certain degree of elasticity and deformability compared to traditional steel plate midsoles, it is prone to warping or displacement during puncture testing. The pressure plate's compression and limiting effect effectively ensures the positional stability of the shoe midsole during testing, preventing uneven force on the testing needle due to midsole displacement, thereby improving testing quality.

[0021] 3. This application injects high-pressure gas into the high-temperature detection zone, utilizing the rapid thermal conduction characteristics of high-pressure gas to accelerate the heating process of the high-temperature detection zone, significantly reducing the heating waiting time. It can reach the preset high-temperature detection environment in a shorter time, allowing the intensified movement of polymer chain segments and the decrease in puncture resistance after material softening of the polymer composite shoe midsole under high temperature conditions to be quickly presented, thereby improving the overall detection efficiency.

[0022] 4. The feeding, room temperature testing, high temperature testing, and material cooling processes of this application can be carried out in parallel and overlapping. That is, while the previous shoe midsole is being tested at high temperature, the next shoe midsole can be tested at room temperature at the same time, and the next shoe midsole can be fed and positioned at the same time. Each station operates continuously and alternately, which maximizes the batch testing efficiency of polymer composite shoe midsoles and meets the factory testing requirements for industrial mass production.

[0023] In summary, this invention enables multi-point, high-efficiency, and high-accuracy puncture resistance testing of work shoe midsoles made primarily of polymer composite materials under both normal and high-temperature environments. It effectively overcomes the technical shortcomings of existing testing equipment, such as single-location testing, inability to simulate high-temperature conditions, and low testing efficiency. This provides a reliable testing method for the quality control and performance optimization of polymer composite shoe midsoles. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the puncture resistance testing device for the midsole of a work shoe made of polymer composite material, as proposed in this invention.

[0025] Figure 2 This is a top view of a semi-cylinder;

[0026] Figure 3 for Figure 2 AA-direction cross-section diagram;

[0027] Figure 4 for Figure 3 Enlarged view of point B;

[0028] Figure 5 for Figure 3 Enlarged view of point C.

[0029] Figure 6 This is a partial structural diagram of the pressurization mechanism.

[0030] Figure 7 for Figure 6 Cross-sectional view;

[0031] Figure 8 for Figure 1 Front view diagram;

[0032] Figure 9 for Figure 8 DD-direction cross-section view.

[0033] In the diagram: 1. Base frame, 2. Semi-cylinder, 3. Vent, 4. Rotary table, 5. Placement slot, 6. Drive motor, 7. First L-shaped frame, 8. Gearbox, 9. Piston cylinder, 10. Inner cavity, 11. Strip-shaped opening, 12. Partition plate, 13. Connecting cylinder, 14. Connecting plate, 15. Sliding block, 16. Connecting rod, 17. First spring, 18. Limiting ring, 19. Columnar groove, 20. First rack, 21. Second L-shaped frame, 22. Cylinder, 23. Connecting plate, 24. Detection pin, 25. Pressure plate, 26. U-shaped frame, 27. Fixing frame, 28. Second rack, 29. One-way opening, 30. Strip-shaped through-hole, 31. Rotating shaft, 32. Transmission gear, 33. Electric heating ring, 34. One-way tube, 35. Second spring, 36. Piston plate, 37. Incomplete gear, 38. Third rack, 39. Guide plate. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0035] Reference Figures 1-9 A puncture resistance testing device for the midsole of a work shoe made of polymer composite material includes a base frame 1. A semi-cylinder 2 is fixedly connected to the upper end of the base frame 1. An inner cavity 10 is provided inside the semi-cylinder 2. A strip-shaped opening 11 is opened on one side wall of the inner cavity 10. A rotating platform 4 that can rotate intermittently by a quarter turn is installed at the upper end of the base frame 1. A part of the rotating platform 4 passes through the strip-shaped opening 11 and extends into the inner cavity 10. A partition 12 is fixedly connected between the inner walls of the inner cavity 10. The partition 12 cooperates with the rotating platform 4 to divide the inner cavity 10 into a normal temperature testing area and a sealed high temperature testing area. Furthermore, in order to ensure the sealing, a rubber sealing layer is provided on the outer side of the rotating platform 4, the top of the left side of the strip-shaped opening 11, and the lower end of the partition 12.

[0036] An electric heating ring 33 is installed at the top inner edge of the high-temperature testing area. The electric heating ring 33 can be continuously activated. The normal temperature testing area and the high-temperature testing area are arranged sequentially along the rotation direction of the rotary table 4. Both the normal temperature testing area and the high-temperature testing area are equipped with testing mechanisms. The testing mechanisms include a second L-shaped frame 21 installed at the top of the normal temperature testing area and the high-temperature testing area, respectively. A cylinder 22 is installed on the horizontal part of the second L-shaped frame 21. The output shaft of the cylinder 22 is fixedly connected to a pressure plate 25. Three detection nails 24 are fixedly connected to the lower end of the pressure plate 25. During the test, the cylinder 22 outputs a fixed pressure to achieve puncture detection of the shoe midsole. It should be noted that the cylinder 22 starts the testing operation about 2 minutes after the drive motor 6 stops rotating each time, to ensure that the testing environment meets the requirements. In addition, the specific positions of the detection nails 24 in the normal temperature testing area and the high-temperature testing area are different to avoid the situation where the two detection positions overlap and affect the accuracy of the test.

[0037] A drive motor 6 is installed at the lower end of the base frame 1. The drive motor 6 is a dual-axis motor. The upper output shaft of the drive motor 6 passes through the base frame 1 and is fixedly connected to the lower end of the rotary table 4. The upper end of the rotary table 4 has four placement slots 5. In use, the shoe midsole needs to be placed in the front placement slot 5. The shoe midsole passes through the normal temperature test area on the right and the high temperature test area at the rear in sequence, and is finally taken out in the left placement slot 5. Furthermore, the station at the left placement slot 5 has a natural cooling function. This station increases the actual cooling time, ensuring that the shoe midsole is placed in the completely cooled placement slot 5 before testing.

[0038] It also includes a high-pressure gas injection mechanism, which is located below the base frame 1. After each operation of the rotating table 4, high-pressure gas can be injected into the sealed high-temperature test area to generate high pressure inside, thereby increasing the speed at which high temperature penetrates the shoe midsole and reducing the waiting time for heating.

[0039] The high-pressure gas injection mechanism includes a piston cylinder 9 mounted on the lower end of the base frame 1. A piston plate 36, which can slide left and right, is installed inside the piston cylinder 9. The right side of the piston plate 36 is elastically connected to the right side wall of the piston cylinder 9 via a second spring 35. A third rack 38 is fixedly connected to the left side of the piston plate 36. A first L-shaped frame 7 is fixedly connected to the lower end of the base frame 1. A gearbox 8 is mounted on the lower horizontal part of the first L-shaped frame 7. The lower output shaft of the drive motor 6 is fixedly connected to the input shaft of the gearbox 8. An incomplete gear 37 is fixedly connected to the output shaft of the gearbox 8. The incomplete gear 37 is connected to the first L-shaped frame 6. With the three racks 38 engaged, and the starting of the gearbox 8, each time the drive motor 6 starts and rotates a quarter turn, the incomplete gear 37 can complete a full turn. Furthermore, the incomplete gear 37 uses a gear with one-third of its teeth untoothed. When it is not rotating, it is just disengaged from the third rack 38. It needs to rotate for another 6-8 seconds before it contacts the third rack 38. When it engages with the third rack 38, its rotation can drive the third rack 38 to move to the left. When it is not engaged, under the elastic action of the second spring 35, both the third rack 38 and the piston plate 36 will move back.

[0040] Two guide plates 39 are fixedly connected to the left side wall of the piston cylinder 9. The opposite sides of the two guide plates 39 are in contact with the third rack 38 and are slidably connected. The right side space of the piston cylinder 9 is connected to the outside through a one-way port 29. The right side space of the piston cylinder 9 is connected to the high temperature test area through a one-way pipe 34. A first one-way valve is installed inside the one-way port 29. The flow direction of the first one-way valve is one-way from the outside into the piston cylinder 9. A second one-way valve is installed inside the one-way pipe 34. The flow direction of the second one-way valve is one-way from the right side space of the piston cylinder 9 into the high temperature test area.

[0041] The high-temperature test area has a vent 3 at the top inside. A solenoid valve is installed inside the vent 3. The solenoid valve can be de-energized after the drive motor 6 has been running for 5 seconds.

[0042] The system also includes a pressurizing mechanism, which comprises two connecting cylinders 13 fixedly connected to the upper end of the semi-cylinder 2. The bottom of each connecting cylinder 13 is provided with a columnar groove 19 communicating with the inner cavity 10. Each columnar groove 19 is slidably connected with a sliding block 15. The upper end of each sliding block 15 is elastically connected to the inner top of the columnar groove 19 through a first spring 17. The spring constant of the first spring 17 is one-eighth of the spring constant of the second spring 35. A limit ring 18 is fixedly connected to the inner wall of each columnar groove 19. A connecting rod 16 is fixedly connected to the upper end of each sliding block 15. The upper ends of the two connecting rods 16 extend to the outside and are fixedly connected to a connecting plate 14. The sliding block 15 that cooperates with the high-temperature test zone is a rubber piston block, which can slide upward when the air pressure inside the high-temperature test zone increases.

[0043] The room temperature test area and the high temperature test area are both fixedly connected to a fixed frame 27. Each fixed frame 27 is fixedly connected to a loop frame 26. The lower end of each sliding block 15 is fixedly connected to a first rack 20. The lower end of each first rack 20 extends into the corresponding loop frame 26 and is slidably connected thereto. A second rack 28 is slidably connected inside each loop frame 26. The lower end of each second rack 28 is fixedly connected to a pressure plate 25. Each pressure plate 25 has a strip-shaped through-hole 30. A rotating shaft 31 is rotatably connected between the inner walls of each loop frame 26. A transmission gear 32 is fixedly connected to each rotating shaft 31. Each transmission gear 32 meshes with the corresponding first rack 20 and second rack 28.

[0044] In this invention, the shoe midsole to be tested is placed in the placement slot 5 in front of the rotating table 4. The drive motor 6 is started, and its upper output shaft drives the rotating table 4 to rotate intermittently by a quarter turn. The shoe midsole passes through the normal temperature test area on the right and the high temperature test area at the rear in sequence. During the rotation of the rotating table 4, since the outer side of the rotating table 4, the top of the left side of the strip opening 11, and the lower end of the partition 12 are all provided with rubber sealing layers, the sealing of the normal temperature test area and the high temperature test area is guaranteed.

[0045] When the shoe midsole enters the room temperature test area, the drive motor 6 stops rotating. After waiting for 2 minutes, the cylinder 22 on the second L-shaped frame 21 at the top of the room temperature test area starts, outputs fixed pressure, pushes the three detection nails 24 at the lower end of the pressure plate 25 to perform puncture test on the shoe midsole, and then resets.

[0046] It should be noted that during the rotation of the drive motor 6, it will also cause the incomplete gear 37 to rotate through the gearbox 8. After the incomplete gear 37 rotates for 6-8 seconds, it will engage with the third rack 38, causing the third rack 38 to move to the left. The third rack 38 will cause the piston plate 36 to move to the left inside the piston cylinder 9, drawing outside air into the right space of the piston cylinder 9 through the one-way port 29 (the internal first one-way valve flows into the piston cylinder 9 in a one-way direction from the outside). When the incomplete gear 37 and the third rack 38 are not meshed, that is, after a single rotation of the drive motor 6 is completed, under the elastic action of the second spring 35, the third rack 38 and the piston plate 36 move back, injecting the air in the right space of the piston cylinder 9 into the sealed high-temperature test area through the one-way pipe 34 (the internal second one-way valve flows one-way into the high-temperature test area from the right space of the piston cylinder 9), so that high pressure is generated inside. When the air pressure inside the high-temperature test area increases, the corresponding sliding block 15 slides upward. At the same time, through the transmission of the first rack 20, the transmission gear 32 and the second rack 28, the pressure plate 25 moves downward. With the synchronization of the connecting plate 14, the pressure plate 25 in the normal temperature test area can also move downward, pressurizing and limiting the midsole of the shoe to ensure stability during testing.

[0047] After the ambient temperature test is completed, the drive motor 6 starts, and the solenoid valve in the vent 3 at the top of the high temperature test area works for 5 seconds and then cuts off the power. The high pressure gas in the high temperature test area (as well as the gas stored in the piston cylinder 9) can be discharged through the vent 3. Under the elastic action of the first spring 17 and the second spring 35, the structure is reset.

[0048] The process is then repeated. The shoe midsole enters the high-temperature testing zone. Before the shoe midsole enters the high-temperature testing zone, the electric heating ring 33 is always in the activated state to heat the high-temperature testing zone. When the rotating table 4 rotates and the shoe midsole enters the high-temperature testing zone, the drive motor 6 stops rotating for about 2 minutes before testing is performed again. During this process, because the high-temperature testing zone is under high pressure, the speed at which the high temperature penetrates the shoe midsole can be increased, the heating waiting time can be reduced, and the testing environment can be reached without waiting for a long time, thus improving the overall testing efficiency.

[0049] After the high-temperature test is completed, the shoe midsole is rotated to the placement slot 5 on the left side with the rotating table 4. The tested shoe midsole is taken out. This station has a natural cooling function to ensure that after it is completely cooled, a new shoe midsole is put into the placement slot 5 for testing.

[0050] It is worth mentioning that the above testing process has good continuity, which means that the operations of feeding, room temperature testing, high temperature testing and material cooling can be overlapped, ensuring the overall testing efficiency.

[0051] The following describes the formula and manufacturing process of the shoe midsole in this application:

[0052] The insole of the work shoes of this application is made of polymer composite material, and its formula includes the following components by weight: 100 parts of bisphenol A type epoxy resin, 15-25 parts of thermoplastic polyurethane elastomer, 30-45 parts of chopped E-glass fiber, 10-20 parts of chopped basalt fiber, 25-35 parts of modified alicyclic amine curing agent, 5-10 parts of core-shell structured rubber particle toughening agent, 1-3 parts of γ-aminopropyltriethoxysilane coupling agent, 8-15 parts of nano silica, 10-20 parts of aluminum hydroxide, 0.5-1.5 parts of organosilicon leveling agent, and 0.3-0.8 parts of organosilicon defoamer.

[0053] The bisphenol A epoxy resin serves as the main binder, providing rigidity and chemical resistance. The thermoplastic polyurethane elastomer is a toughening modifier, enhancing the material's flexibility and low-temperature impact resistance. Chopped E-glass fiber, with a fiber length of 3-6 mm, is the primary reinforcing material, providing puncture resistance. Chopped basalt fiber, also with a length of 3-6 mm, is an auxiliary reinforcing material, improving the material's temperature and abrasion resistance. The mass ratio of glass fiber to basalt fiber is 3:1-2:1. The total fiber mass accounts for 25%-35% of the total formulation mass. The nano-silica particles, with a particle size of 20-50 nm, enhance the material's surface hardness and abrasion resistance. The aluminum hydroxide provides both flame retardancy and filling functions. The core-shell structured rubber particle toughening agent uses MBS, which offers more uniform dispersion and higher toughening efficiency compared to traditional liquid rubber toughening agents.

[0054] The method for preparing the midsole of work shoes includes the following steps:

[0055] S1. Fiber pretreatment: Short-cut E-glass fibers and short-cut basalt fibers are respectively immersed in a coupling agent solution for surface treatment. The mass ratio of coupling agent, ethanol and water in the coupling agent solution is 1:5:95, and the immersion time is 20-40 min. After removal, they are dried at 50-70℃ for 1.5-3 h to obtain pretreated glass fibers and basalt fibers for later use.

[0056] S2. Resin matrix preparation: Heating bisphenol A epoxy resin to 50-70℃ to reduce its viscosity, adding thermoplastic polyurethane elastomer particles, and mechanically stirring at 70-90℃ for 20-40 minutes until the elastomer is completely dissolved; then adding nano-silica and aluminum hydroxide sequentially, and dispersing at high speed of 1500-2500 rpm for 15-25 minutes; then adding leveling agent and defoamer, and stirring at low speed for 3-8 minutes; finally, degassing under a vacuum of -0.08-0.1 MPa for 10-20 minutes to obtain the modified resin matrix;

[0057] S3. Fiber hybrid dispersion: The glass fiber and basalt fiber pretreated in step S1 are mixed evenly according to the ratio, and the two fibers are evenly dispersed by an airflow dispersion device to obtain a hybrid fiber reinforcement.

[0058] S4. Mixing and adding curing agent: Add the hybrid fiber reinforcement obtained in step S3 to the modified resin matrix obtained in step S2, and stir at a low speed of 400-600 rpm for 8-15 min; add the core-shell structured rubber particle toughening agent, and continue stirring for 3-8 min; add the modified alicyclic amine curing agent, and stir rapidly for 2-5 min to obtain the mixture.

[0059] S5. Compression Molding: Pour the mixture obtained in step S4 into a shoe midsole mold preheated to 70-90℃. After closing the mold, apply a pressure of 8-16MPa. Use a stepped temperature curing process: first, keep the temperature at 70-90℃ for 0.5-1.5h, then raise the temperature to 110-130℃ and keep it for 1.5-2.5h, and finally raise the temperature to 140-160℃ and keep it for 0.5-1.5h. After curing, allow it to cool naturally to below 50-70℃ before demolding to obtain the shoe midsole blank.

[0060] S6. Post-processing: The shoe midsole blank after demolding in step S5 is sanded and trimmed, and the size and appearance are inspected to obtain the finished polymer composite material work shoe midsole.

[0061] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A puncture resistance testing device for the midsole of work shoes made of polymer composite material, characterized in that, include: A base frame (1) is fixedly connected to a semi-cylinder (2) at its upper end. An inner cavity (10) is provided inside the semi-cylinder (2). A strip-shaped opening (11) is provided on one side wall of the inner cavity (10). A rotating platform (4) that can rotate intermittently by a quarter turn is installed at the upper end of the base frame (1). A part of the rotating platform (4) passes through the strip-shaped opening (11) and extends into the inner cavity (10). A partition (12) is fixedly connected between the inner walls of the inner cavity (10). The partition (12) cooperates with the rotating platform (4) to divide the inner cavity (10) into a room temperature test area and a sealed area. The high temperature test area is equipped with an electric heating ring (33) installed on the inner top of the high temperature test area. The normal temperature test area and the high temperature test area are arranged in sequence along the rotation direction of the rotary table (4). The normal temperature test area and the high temperature test area are equipped with a test mechanism. The test mechanism includes a second L-shaped frame (21) installed on the top of the normal temperature test area and the high temperature test area respectively. A cylinder (22) is installed on the horizontal part of the second L-shaped frame (21). The output shaft of the cylinder (22) is fixedly connected to a pressure plate (25). The lower end of the pressure plate (25) is fixedly connected to three detection nails (24). The high-pressure gas injection mechanism is located below the base frame (1). After each rotation table (4) stops working, it can inject high-pressure gas into the sealed high-temperature test area to generate high pressure inside, thereby increasing the speed at which high temperature penetrates the shoe midsole and reducing the waiting time for heating.

2. The puncture resistance testing device for the midsole of work shoes made of polymer composite material according to claim 1, characterized in that, The lower end of the base frame (1) is equipped with a drive motor (6), which is a dual-axis motor. The upper output shaft of the drive motor (6) passes through the base frame (1) and is fixedly connected to the lower end of the rotary table (4). The upper end of the rotary table (4) is provided with four placement slots (5).

3. The puncture resistance testing device for the midsole of a work shoe made of polymer composite material according to claim 1, characterized in that, The high-pressure gas injection mechanism includes a piston cylinder (9) installed at the lower end of the base frame (1). A piston plate (36) that can slide left and right is provided inside the piston cylinder (9). The right side of the piston plate (36) is elastically connected to the right side wall of the piston cylinder (9) through a second spring (35). A third rack (38) is fixedly connected to the left side of the piston plate (36). A first L-shaped frame (7) is fixedly connected to the lower end of the base frame (1). A gearbox (8) is installed at the lower end of the horizontal part of the first L-shaped frame (7). The lower output shaft of the drive motor (6) is fixedly connected to the input shaft of the gearbox (8). An incomplete gear (37) is fixedly connected to the output shaft of the gearbox (8). The incomplete gear (37) cooperates with the third rack (38).

4. The puncture resistance testing device for the midsole of a work shoe made of polymer composite material according to claim 3, characterized in that, Two guide plates (39) are fixedly connected to the left side wall of the piston cylinder (9). The opposite sides of the two guide plates (39) are in contact with the third rack (38) and are slidably connected.

5. The puncture resistance testing device for the midsole of a work shoe made of polymer composite material according to claim 3, characterized in that, The right side space of the piston cylinder (9) is connected to the outside through a one-way port (29), and the right side space of the piston cylinder (9) is connected to the high temperature test area through a one-way pipe (34).

6. The puncture resistance testing device for the midsole of a work shoe made of polymer composite material according to claim 5, characterized in that, The one-way port (29) is equipped with a first one-way valve, which allows the flow of the first one-way valve to enter the piston cylinder (9) from the outside. The one-way pipe (34) is equipped with a second one-way valve, which allows the flow of the second one-way valve to enter the high-temperature test area from the right side space of the piston cylinder (9).

7. The puncture resistance testing device for the midsole of a work shoe made of polymer composite material according to claim 6, characterized in that, The high-temperature test area has a vent (3) at the top inside. A solenoid valve is installed inside the vent (3). The solenoid valve can be de-energized after the drive motor (6) has been running for 5 seconds.

8. The puncture resistance testing device for the midsole of a work shoe made of polymer composite material according to claim 1, characterized in that, It also includes a pressurizing mechanism, which includes two connecting cylinders (13) fixedly connected to the upper end of the semi-cylinder (2). The inner bottom of each of the two connecting cylinders (13) is provided with a columnar groove (19) communicating with the inner cavity (10). A sliding block (15) is slidably connected inside each columnar groove (19). The upper end of each sliding block (15) is elastically connected to the inner top of the columnar groove (19) through a first spring (17). A limit ring (18) is fixedly connected to the inner wall of each columnar groove (19). A connecting rod (16) is fixedly connected to the upper end of each sliding block (15). The upper ends of the two connecting rods (16) extend to the outside and are fixedly connected to a connecting plate (14).

9. The puncture resistance testing device for the midsole of a work shoe made of polymer composite material according to claim 8, characterized in that, Both the room temperature test area and the high temperature test area are fixedly connected to a fixed frame (27). Each fixed frame (27) is fixedly connected to a loop frame (26). The lower end of each sliding block (15) is fixedly connected to a first rack (20). The lower end of each first rack (20) extends into the corresponding loop frame (26) and is slidably connected thereto. A second rack (28) is slidably connected inside each loop frame (26). The lower end of each second rack (28) is fixedly connected to a pressure plate (25). Each pressure plate (25) has a strip-shaped through-hole (30). A rotating shaft (31) is rotatably connected between the inner walls of each loop frame (26). A transmission gear (32) is fixedly connected to each rotating shaft (31). Each transmission gear (32) meshes with the corresponding first rack (20) and second rack (28).

10. The puncture resistance testing device for the midsole of a work shoe made of polymer composite material according to claim 9, characterized in that, The sliding block (15) that works with the high-temperature test zone is made of rubber piston block, which can slide upward when the air pressure inside the high-temperature test zone increases.

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